15858563968 has 128 divisors (see below), whose sum is σ = 36435420000. Its totient is φ = 6810304512.

The previous prime is 15858563953. The next prime is 15858563971. The reversal of 15858563968 is 86936585851.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×15858563968² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2514483 + ... + 2520781.

Almost surely, 2^15858563968 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 15858563968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18217710000).

15858563968 is an abundant number, since it is smaller than the sum of its proper divisors (20576856032).

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

15858563968 is a wasteful number, since it uses less digits than its factorization.

15858563968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432 (or 6420 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 64.

The spelling of 15858563968 in words is "fifteen billion, eight hundred fifty-eight million, five hundred sixty-three thousand, nine hundred sixty-eight".