15425878656 has 64 divisors (see below), whose sum is σ = 41107060800. Its totient is φ = 5125386240.

The previous prime is 15425878651. The next prime is 15425878667. The reversal of 15425878656 is 65687852451.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 15425878596 and 15425878605.

It is not an unprimeable number, because it can be changed into a prime (15425878651) 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, 54840 + ... + 184008.

It is an arithmetic number, because the mean of its divisors is an integer number (642297825).

Almost surely, 2^15425878656 is an apocalyptic number.

15425878656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15425878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20553530400).

15425878656 is an abundant number, since it is smaller than the sum of its proper divisors (25681182144).

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

15425878656 is a wasteful number, since it uses less digits than its factorization.

15425878656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129497 (or 129485 counting only the distinct ones).

The product of its digits is 16128000, while the sum is 57.

The spelling of 15425878656 in words is "fifteen billion, four hundred twenty-five million, eight hundred seventy-eight thousand, six hundred fifty-six".