165457971 has 48 divisors (see below), whose sum is σ = 285212928. Its totient is φ = 93895200.

The previous prime is 165457949. The next prime is 165457987. The reversal of 165457971 is 179754561.

165457971 is a `hidden beast` number, since 1 + 6 + 5 + 4 + 579 + 71 = 666.

165457971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165457971 - 2⁵ = 165457939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165458971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 358681 + ... + 359141.

It is an arithmetic number, because the mean of its divisors is an integer number (5941936).

Almost surely, 2^165457971 is an apocalyptic number.

165457971 is a deficient number, since it is larger than the sum of its proper divisors (119754957).

165457971 is an equidigital number, since it uses as much as digits as its factorization.

165457971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 682 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 165457971 is about 12863.0467230746. The cubic root of 165457971 is about 548.9876374534.

The spelling of 165457971 in words is "one hundred sixty-five million, four hundred fifty-seven thousand, nine hundred seventy-one".