168564501940 has 24 divisors (see below), whose sum is σ = 354950007552. Its totient is φ = 67242076320.

The previous prime is 168564501923. The next prime is 168564501943. The reversal of 168564501940 is 49105465861.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168564501943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11475256 + ... + 11489935.

It is an arithmetic number, because the mean of its divisors is an integer number (14789583648).

Almost surely, 2^168564501940 is an apocalyptic number.

168564501940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168564501940 is an abundant number, since it is smaller than the sum of its proper divisors (186385505612).

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

168564501940 is a wasteful number, since it uses less digits than its factorization.

168564501940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22965567 (or 22965565 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 168564501940 in words is "one hundred sixty-eight billion, five hundred sixty-four million, five hundred one thousand, nine hundred forty".