15851061801 has 21 divisors (see below), whose sum is σ = 23770818669. Its totient is φ = 10565108316.

The previous prime is 15851061781. The next prime is 15851061839. The reversal of 15851061801 is 10816015851.

The square root of 15851061801 is 125901.

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

15851061801 is a `hidden beast` number, since 1 + 5 + 8 + 510 + 61 + 80 + 1 = 666.

It is not a de Polignac number, because 15851061801 - 2⁷ = 15851061673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15851061841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 3396996 + ... + 3401658.

Almost surely, 2^15851061801 is an apocalyptic number.

15851061801 is the 125901-st square number.

15851061801 is the 62951-st centered octagonal number.

It is an amenable number.

15851061801 is a deficient number, since it is larger than the sum of its proper divisors (7919756868).

15851061801 is an frugal number, since it uses more digits than its factorization.

15851061801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344 (or 4666 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 36.

Multiplying 15851061801 by its sum of digits (36), we get a square (570638224836 = 755406²).

The spelling of 15851061801 in words is "fifteen billion, eight hundred fifty-one million, sixty-one thousand, eight hundred one".