166901257 has 6 divisors (see below), whose sum is σ = 177296798. Its totient is φ = 157083264.

The previous prime is 166901249. The next prime is 166901261. The reversal of 166901257 is 752109661.

166901257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 42823936 + 124077321 = 6544^2 + 11139^2 .

It is not a de Polignac number, because 166901257 - 2³ = 166901249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166901227) 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, 288468 + ... + 289045.

Almost surely, 2^166901257 is an apocalyptic number.

166901257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166901257 is a deficient number, since it is larger than the sum of its proper divisors (10395541).

166901257 is an equidigital number, since it uses as much as digits as its factorization.

166901257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577547 (or 577530 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 166901257 is about 12919.0269370413. The cubic root of 166901257 is about 550.5792871726.

The spelling of 166901257 in words is "one hundred sixty-six million, nine hundred one thousand, two hundred fifty-seven".