165324881799 has 96 divisors (see below), whose sum is σ = 322573515264. Its totient is φ = 78951075840.

The previous prime is 165324881779. The next prime is 165324881803. The reversal of 165324881799 is 997188423561.

165324881799 is a `hidden beast` number, since 1 + 6 + 53 + 2 + 488 + 17 + 99 = 666.

It is not a de Polignac number, because 165324881799 - 2⁵ = 165324881767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165324881719) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 343407 + ... + 669759.

It is an arithmetic number, because the mean of its divisors is an integer number (3360140784).

Almost surely, 2^165324881799 is an apocalyptic number.

165324881799 is a deficient number, since it is larger than the sum of its proper divisors (157248633465).

165324881799 is a wasteful number, since it uses less digits than its factorization.

165324881799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326437 (or 326434 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 165324881799 in words is "one hundred sixty-five billion, three hundred twenty-four million, eight hundred eighty-one thousand, seven hundred ninety-nine".