165214642556361 has 32 divisors (see below), whose sum is σ = 222889128284160. Its totient is φ = 108846193083264.

The previous prime is 165214642556333. The next prime is 165214642556389. The reversal of 165214642556361 is 163655246412561.

It is an interprime number because it is at equal distance from previous prime (165214642556333) and next prime (165214642556389).

It is not a de Polignac number, because 165214642556361 - 2⁵ = 165214642556329 is a prime.

It is a super-2 number, since 2×165214642556361² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165214642556461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 663966976 + ... + 664215758.

It is an arithmetic number, because the mean of its divisors is an integer number (6965285258880).

Almost surely, 2^{165214642556361} is an apocalyptic number.

It is an amenable number.

165214642556361 is a deficient number, since it is larger than the sum of its proper divisors (57674485727799).

165214642556361 is a wasteful number, since it uses less digits than its factorization.

165214642556361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253365.

The product of its digits is 31104000, while the sum is 57.

The spelling of 165214642556361 in words is "one hundred sixty-five trillion, two hundred fourteen billion, six hundred forty-two million, five hundred fifty-six thousand, three hundred sixty-one".