165571120266 has 32 divisors (see below), whose sum is σ = 336785964480. Its totient is φ = 54249926016.

The previous prime is 165571120261. The next prime is 165571120279. The reversal of 165571120266 is 662021175561.

It is a super-2 number, since 2×165571120266² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165571120261) 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, 7606150 + ... + 7627886.

It is an arithmetic number, because the mean of its divisors is an integer number (10524561390).

Almost surely, 2^165571120266 is an apocalyptic number.

165571120266 is an abundant number, since it is smaller than the sum of its proper divisors (171214844214).

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

165571120266 is a wasteful number, since it uses less digits than its factorization.

165571120266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43318.

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 165571120266 in words is "one hundred sixty-five billion, five hundred seventy-one million, one hundred twenty thousand, two hundred sixty-six".