165572071 has 16 divisors (see below), whose sum is σ = 194365440. Its totient is φ = 138116160.

The previous prime is 165572021. The next prime is 165572081. The reversal of 165572071 is 170275561.

It is a happy number.

It is not a de Polignac number, because 165572071 - 2¹¹ = 165570023 is a prime.

It is a super-2 number, since 2×165572071² = 54828221390458082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165572021) 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 15 ways as a sum of consecutive naturals, for example, 37155 + ... + 41371.

It is an arithmetic number, because the mean of its divisors is an integer number (12147840).

Almost surely, 2^165572071 is an apocalyptic number.

165572071 is a deficient number, since it is larger than the sum of its proper divisors (28793369).

165572071 is an equidigital number, since it uses as much as digits as its factorization.

165572071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374.

The product of its (nonzero) digits is 14700, while the sum is 34.

The square root of 165572071 is about 12867.4811443421. The cubic root of 165572071 is about 549.1138026175.

The spelling of 165572071 in words is "one hundred sixty-five million, five hundred seventy-two thousand, seventy-one".