166020957 has 6 divisors (see below), whose sum is σ = 239808062. Its totient is φ = 110680632.

The previous prime is 166020947. The next prime is 166020971. The reversal of 166020957 is 759020661.

It can be written as a sum of positive squares in only one way, i.e., 143496441 + 22524516 = 11979^2 + 4746^2 .

It is not a de Polignac number, because 166020957 - 2⁴ = 166020941 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 (166020937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9223378 + ... + 9223395.

Almost surely, 2^166020957 is an apocalyptic number.

It is an amenable number.

166020957 is a deficient number, since it is larger than the sum of its proper divisors (73787105).

166020957 is a wasteful number, since it uses less digits than its factorization.

166020957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18446779 (or 18446776 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 166020957 is about 12884.9119903863. The cubic root of 166020957 is about 549.6095929149.

The spelling of 166020957 in words is "one hundred sixty-six million, twenty thousand, nine hundred fifty-seven".