15625666560 has 480 divisors, whose sum is σ = 59188211712. Its totient is φ = 3444572160.

The previous prime is 15625666549. The next prime is 15625666583. The reversal of 15625666560 is 6566652651.

It is a tau number, because it is divible by the number of its divisors (480).

It is a super-2 number, since 2×15625666560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53329774 + ... + 53330066.

Almost surely, 2^15625666560 is an apocalyptic number.

15625666560 is a gapful number since it is divisible by the number (10) 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 15625666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29594105856).

15625666560 is an abundant number, since it is smaller than the sum of its proper divisors (43562545152).

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

15625666560 is an equidigital number, since it uses as much as digits as its factorization.

15625666560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 15625666560 in words is "fifteen billion, six hundred twenty-five million, six hundred sixty-six thousand, five hundred sixty".