15664210056 has 128 divisors (see below), whose sum is σ = 47676240000. Its totient is φ = 4725838080.

The previous prime is 15664210021. The next prime is 15664210087. The reversal of 15664210056 is 65001246651.

15664210056 is a `hidden beast` number, since 1 + 5 + 6 + 642 + 1 + 0 + 0 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 15664210056.

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, 529710 + ... + 558498.

It is an arithmetic number, because the mean of its divisors is an integer number (372470625).

Almost surely, 2^15664210056 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 15664210056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23838120000).

15664210056 is an abundant number, since it is smaller than the sum of its proper divisors (32012029944).

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

15664210056 is a wasteful number, since it uses less digits than its factorization.

15664210056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29044 (or 29034 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 15664210056 in words is "fifteen billion, six hundred sixty-four million, two hundred ten thousand, fifty-six".