165620121168 has 40 divisors (see below), whose sum is σ = 427921768000. Its totient is φ = 55197702144.

The previous prime is 165620121127. The next prime is 165620121181. The reversal of 165620121168 is 861121026561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19248 + ... + 575856.

It is an arithmetic number, because the mean of its divisors is an integer number (10698044200).

Almost surely, 2^165620121168 is an apocalyptic number.

It is an amenable number.

165620121168 is an abundant number, since it is smaller than the sum of its proper divisors (262301646832).

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

165620121168 is a wasteful number, since it uses less digits than its factorization.

165620121168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562819 (or 562813 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 165620121168 in words is "one hundred sixty-five billion, six hundred twenty million, one hundred twenty-one thousand, one hundred sixty-eight".