16263645841 has 3 divisors (see below), whose sum is σ = 16263773371. Its totient is φ = 16263518312.

The previous prime is 16263645721. The next prime is 16263645869. The reversal of 16263645841 is 14854636261.

The square root of 16263645841 is 127529.

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.

It can be written as a sum of positive squares in only one way, i.e., 7009205841 + 9254440000 = 83721^2 + 96200^2 .

It is not a de Polignac number, because 16263645841 - 2¹⁵ = 16263613073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16263645791 and 16263645800.

It is not an unprimeable number, because it can be changed into a prime (16263645341) 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, 63765 + ... + 191293.

Almost surely, 2^16263645841 is an apocalyptic number.

16263645841 is the 127529-th square number.

16263645841 is the 63765-th centered octagonal number.

It is an amenable number.

16263645841 is a deficient number, since it is larger than the sum of its proper divisors (127530).

16263645841 is an frugal number, since it uses more digits than its factorization.

16263645841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255058 (or 127529 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The spelling of 16263645841 in words is "sixteen billion, two hundred sixty-three million, six hundred forty-five thousand, eight hundred forty-one".