166565351 has 4 divisors (see below), whose sum is σ = 166616304. Its totient is φ = 166514400.

The previous prime is 166565339. The next prime is 166565383. The reversal of 166565351 is 153565661.

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

It is a cyclic number.

It is not a de Polignac number, because 166565351 - 2²² = 162371047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166565251) 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, 20210 + ... + 27231.

It is an arithmetic number, because the mean of its divisors is an integer number (41654076).

Almost surely, 2^166565351 is an apocalyptic number.

166565351 is a deficient number, since it is larger than the sum of its proper divisors (50953).

166565351 is an equidigital number, since it uses as much as digits as its factorization.

166565351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50952.

The product of its digits is 81000, while the sum is 38.

The square root of 166565351 is about 12906.0199519449. The cubic root of 166565351 is about 550.2096732254.

The spelling of 166565351 in words is "one hundred sixty-six million, five hundred sixty-five thousand, three hundred fifty-one".