166913857 has 4 divisors (see below), whose sum is σ = 182087856. Its totient is φ = 151739860.

The previous prime is 166913849. The next prime is 166913861. The reversal of 166913857 is 758319661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758319661 = 11 ⋅68938151.

It is a cyclic number.

It is not a de Polignac number, because 166913857 - 2³ = 166913849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166913897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7586983 + ... + 7587004.

It is an arithmetic number, because the mean of its divisors is an integer number (45521964).

Almost surely, 2^166913857 is an apocalyptic number.

It is an amenable number.

166913857 is a deficient number, since it is larger than the sum of its proper divisors (15173999).

166913857 is a wasteful number, since it uses less digits than its factorization.

166913857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15173998.

The product of its digits is 272160, while the sum is 46.

The square root of 166913857 is about 12919.5145806644. The cubic root of 166913857 is about 550.5931419203.

The spelling of 166913857 in words is "one hundred sixty-six million, nine hundred thirteen thousand, eight hundred fifty-seven".