165641051 has 4 divisors (see below), whose sum is σ = 166566600. Its totient is φ = 164715504.

The previous prime is 165641027. The next prime is 165641057. The reversal of 165641051 is 150146561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165641051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165641057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462506 + ... + 462863.

It is an arithmetic number, because the mean of its divisors is an integer number (41641650).

Almost surely, 2^165641051 is an apocalyptic number.

165641051 is a deficient number, since it is larger than the sum of its proper divisors (925549).

165641051 is an equidigital number, since it uses as much as digits as its factorization.

165641051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925548.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 165641051 is about 12870.1612655009. The cubic root of 165641051 is about 549.1900485909.

The spelling of 165641051 in words is "one hundred sixty-five million, six hundred forty-one thousand, fifty-one".