15964069801 has 3 divisors (see below), whose sum is σ = 15964196151. Its totient is φ = 15963943452.

The previous prime is 15964069777. The next prime is 15964069829. The reversal of 15964069801 is 10896046951.

The square root of 15964069801 is 126349.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10896046951 = 197 ⋅55309883.

It can be written as a sum of positive squares in only one way, i.e., 15800741401 + 163328400 = 125701^2 + 12780^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15964069801 is a prime.

It is a super-2 number, since 2×15964069801² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15964069831) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63175 + ... + 189523.

It is an arithmetic number, because the mean of its divisors is an integer number (5321398717).

Almost surely, 2^15964069801 is an apocalyptic number.

15964069801 is the 126349-th square number.

15964069801 is the 63175-th centered octagonal number.

It is an amenable number.

15964069801 is a deficient number, since it is larger than the sum of its proper divisors (126350).

15964069801 is an frugal number, since it uses more digits than its factorization.

15964069801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252698 (or 126349 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

Multiplying 15964069801 by its sum of digits (49), we get a square (782239420249 = 884443²).

It can be divided in two parts, 159640 and 69801, that added together give a square (229441 = 479²).

The spelling of 15964069801 in words is "fifteen billion, nine hundred sixty-four million, sixty-nine thousand, eight hundred one".