165897720868 has 12 divisors (see below), whose sum is σ = 316713830832. Its totient is φ = 75408054920.

The previous prime is 165897720847. The next prime is 165897720883. The reversal of 165897720868 is 868027798561.

165897720868 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885201330 + ... + 1885201417.

It is an arithmetic number, because the mean of its divisors is an integer number (26392819236).

Almost surely, 2^165897720868 is an apocalyptic number.

It is an amenable number.

165897720868 is a deficient number, since it is larger than the sum of its proper divisors (150816109964).

165897720868 is a wasteful number, since it uses less digits than its factorization.

165897720868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770402762 (or 3770402760 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 67.

The spelling of 165897720868 in words is "one hundred sixty-five billion, eight hundred ninety-seven million, seven hundred twenty thousand, eight hundred sixty-eight".