165185678820 has 24 divisors (see below), whose sum is σ = 462519900864. Its totient is φ = 44049514336.

The previous prime is 165185678809. The next prime is 165185678821. The reversal of 165185678820 is 28876581561.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (165185678821) 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, 1376547264 + ... + 1376547383.

It is an arithmetic number, because the mean of its divisors is an integer number (19271662536).

Almost surely, 2^165185678820 is an apocalyptic number.

165185678820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165185678820 is an abundant number, since it is smaller than the sum of its proper divisors (297334222044).

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

165185678820 is a wasteful number, since it uses less digits than its factorization.

165185678820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753094659 (or 2753094657 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 57.

The spelling of 165185678820 in words is "one hundred sixty-five billion, one hundred eighty-five million, six hundred seventy-eight thousand, eight hundred twenty".