166641957 has 24 divisors (see below), whose sum is σ = 250315520. Its totient is φ = 106712640.

The previous prime is 166641953. The next prime is 166641971. The reversal of 166641957 is 759146661.

166641957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166641957 - 2² = 166641953 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166641953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36633 + ... + 40929.

Almost surely, 2^166641957 is an apocalyptic number.

It is an amenable number.

166641957 is a deficient number, since it is larger than the sum of its proper divisors (83673563).

166641957 is a wasteful number, since it uses less digits than its factorization.

166641957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473 (or 4470 counting only the distinct ones).

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

The square root of 166641957 is about 12908.9874506097. The cubic root of 166641957 is about 550.2940102977.

The spelling of 166641957 in words is "one hundred sixty-six million, six hundred forty-one thousand, nine hundred fifty-seven".