15725577664 has 56 divisors (see below), whose sum is σ = 32631644160. Its totient is φ = 7504890624.

The previous prime is 15725577649. The next prime is 15725577667. The reversal of 15725577664 is 46677552751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15725577667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693937 + ... + 716239.

Almost surely, 2^15725577664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15725577664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16315822080).

15725577664 is an abundant number, since it is smaller than the sum of its proper divisors (16906066496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15725577664 is a wasteful number, since it uses less digits than its factorization.

15725577664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22817 (or 22807 counting only the distinct ones).

The product of its digits is 12348000, while the sum is 55.

The spelling of 15725577664 in words is "fifteen billion, seven hundred twenty-five million, five hundred seventy-seven thousand, six hundred sixty-four".