15625026664 has 64 divisors (see below), whose sum is σ = 31929206400. Its totient is φ = 7125325056.

The previous prime is 15625026661. The next prime is 15625026673. The reversal of 15625026664 is 46662052651.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 15625026664.

It is not an unprimeable number, because it can be changed into a prime (15625026661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5600982 + ... + 5603770.

It is an arithmetic number, because the mean of its divisors is an integer number (498893850).

Almost surely, 2^15625026664 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 15625026664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15964603200).

15625026664 is an abundant number, since it is smaller than the sum of its proper divisors (16304179736).

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

15625026664 is a wasteful number, since it uses less digits than its factorization.

15625026664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3434 (or 3430 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 15625026664 in words is "fifteen billion, six hundred twenty-five million, twenty-six thousand, six hundred sixty-four".