165220456351331 has 16 divisors (see below), whose sum is σ = 169419809328000. Its totient is φ = 161037498480768.

The previous prime is 165220456351297. The next prime is 165220456351337. The reversal of 165220456351331 is 133153654022561.

It is a cyclic number.

It is not a de Polignac number, because 165220456351331 - 2¹⁰ = 165220456350307 is a prime.

It is a super-2 number, since 2×165220456351331² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165220456351337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82248395 + ... + 84233243.

It is an arithmetic number, because the mean of its divisors is an integer number (10588738083000).

Almost surely, 2^{165220456351331} is an apocalyptic number.

165220456351331 is a deficient number, since it is larger than the sum of its proper divisors (4199352976669).

165220456351331 is a wasteful number, since it uses less digits than its factorization.

165220456351331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988978.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 165220456351331 in words is "one hundred sixty-five trillion, two hundred twenty billion, four hundred fifty-six million, three hundred fifty-one thousand, three hundred thirty-one".