166165947 has 12 divisors (see below), whose sum is σ = 242493160. Its totient is φ = 109634688.

The previous prime is 166165943. The next prime is 166165957. The reversal of 166165947 is 749561661.

It is not a de Polignac number, because 166165947 - 2² = 166165943 is a prime.

It is a super-2 number, since 2×166165947² = 55222243884813618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166165943) 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, 94297 + ... + 96042.

Almost surely, 2^166165947 is an apocalyptic number.

166165947 is a deficient number, since it is larger than the sum of its proper divisors (76327213).

166165947 is a wasteful number, since it uses less digits than its factorization.

166165947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190442 (or 190439 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 166165947 is about 12890.5371106095. The cubic root of 166165947 is about 549.7695420157.

The spelling of 166165947 in words is "one hundred sixty-six million, one hundred sixty-five thousand, nine hundred forty-seven".