190921508568 has 64 divisors (see below), whose sum is σ = 606100032000. Its totient is φ = 54549002016.

The previous prime is 190921508551. The next prime is 190921508599. The reversal of 190921508568 is 865805129091.

190921508568 is a `hidden beast` number, since 1 + 9 + 0 + 9 + 21 + 50 + 8 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 63133908 + ... + 63136931.

It is an arithmetic number, because the mean of its divisors is an integer number (9470313000).

Almost surely, 2^190921508568 is an apocalyptic number.

190921508568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

190921508568 is an abundant number, since it is smaller than the sum of its proper divisors (415178523432).

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

190921508568 is a wasteful number, since it uses less digits than its factorization.

190921508568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126270861 (or 126270851 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 190921508568 in words is "one hundred ninety billion, nine hundred twenty-one million, five hundred eight thousand, five hundred sixty-eight".