161839863520 has 24 divisors (see below), whose sum is σ = 382346677944. Its totient is φ = 64735945344.

The previous prime is 161839863511. The next prime is 161839863547. The reversal of 161839863520 is 25368938161.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505749414 + ... + 505749733.

It is an arithmetic number, because the mean of its divisors is an integer number (15931111581).

Almost surely, 2^161839863520 is an apocalyptic number.

161839863520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161839863520 is an abundant number, since it is smaller than the sum of its proper divisors (220506814424).

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

161839863520 is a wasteful number, since it uses less digits than its factorization.

161839863520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011499162 (or 1011499154 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 161839863520 in words is "one hundred sixty-one billion, eight hundred thirty-nine million, eight hundred sixty-three thousand, five hundred twenty".