166165225 has 48 divisors (see below), whose sum is σ = 231413760. Its totient is φ = 117708800.

The previous prime is 166165213. The next prime is 166165249. The reversal of 166165225 is 522561661.

It is a de Polignac number, because none of the positive numbers 2^k-166165225 is a prime.

It is a super-2 number, since 2×166165225² = 55221763998601250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 869880 + ... + 870070.

It is an arithmetic number, because the mean of its divisors is an integer number (4821120).

Almost surely, 2^166165225 is an apocalyptic number.

It is an amenable number.

166165225 is a deficient number, since it is larger than the sum of its proper divisors (65248535).

166165225 is a wasteful number, since it uses less digits than its factorization.

166165225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 325 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 166165225 is about 12890.5091055396. The cubic root of 166165225 is about 549.7687457552.

The spelling of 166165225 in words is "one hundred sixty-six million, one hundred sixty-five thousand, two hundred twenty-five".