165898731365730 has 64 divisors (see below), whose sum is σ = 482614491254400. Its totient is φ = 40217874269760.

The previous prime is 165898731365701. The next prime is 165898731365737. The reversal of 165898731365730 is 37563137898561.

165898731365730 is a `hidden beast` number, since 1 + 6 + 589 + 8 + 7 + 3 + 1 + 3 + 6 + 5 + 7 + 30 = 666.

It is a super-2 number, since 2×165898731365730² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165898731365737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27929076385 + ... + 27929082324.

It is an arithmetic number, because the mean of its divisors is an integer number (7540851425850).

Almost surely, 2^{165898731365730} is an apocalyptic number.

165898731365730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165898731365730 is an abundant number, since it is smaller than the sum of its proper divisors (316715759888670).

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

165898731365730 is a wasteful number, since it uses less digits than its factorization.

165898731365730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55858158736 (or 55858158730 counting only the distinct ones).

The product of its (nonzero) digits is 685843200, while the sum is 72.

The spelling of 165898731365730 in words is "one hundred sixty-five trillion, eight hundred ninety-eight billion, seven hundred thirty-one million, three hundred sixty-five thousand, seven hundred thirty".