166679857 has 12 divisors (see below), whose sum is σ = 173032860. Its totient is φ = 160543296.

The previous prime is 166679831. The next prime is 166679869. The reversal of 166679857 is 758976661.

It can be written as a sum of positive squares in 6 ways, for example, as 11826721 + 154853136 = 3439^2 + 12444^2 .

It is not a de Polignac number, because 166679857 - 2⁷ = 166679729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166679798 and 166679807.

It is not an unprimeable number, because it can be changed into a prime (166679257) 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, 148663 + ... + 149779.

It is an arithmetic number, because the mean of its divisors is an integer number (14419405).

Almost surely, 2^166679857 is an apocalyptic number.

It is an amenable number.

166679857 is a deficient number, since it is larger than the sum of its proper divisors (6353003).

166679857 is a wasteful number, since it uses less digits than its factorization.

166679857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300 (or 1263 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 55.

The square root of 166679857 is about 12910.4553366642. The cubic root of 166679857 is about 550.3357256065.

The spelling of 166679857 in words is "one hundred sixty-six million, six hundred seventy-nine thousand, eight hundred fifty-seven".