165566051 has 12 divisors (see below), whose sum is σ = 192860640. Its totient is φ = 141719760.

The previous prime is 165565997. The next prime is 165566059. The reversal of 165566051 is 150665561.

It is not a de Polignac number, because 165566051 - 2¹⁸ = 165303907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165566059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42785 + ... + 46493.

It is an arithmetic number, because the mean of its divisors is an integer number (16071720).

Almost surely, 2^165566051 is an apocalyptic number.

165566051 is a deficient number, since it is larger than the sum of its proper divisors (27294589).

165566051 is an equidigital number, since it uses as much as digits as its factorization.

165566051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4634 (or 4627 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 165566051 is about 12867.2472191996. The cubic root of 165566051 is about 549.1071474992.

The spelling of 165566051 in words is "one hundred sixty-five million, five hundred sixty-six thousand, fifty-one".