166400379 has 16 divisors (see below), whose sum is σ = 246935040. Its totient is φ = 110746440.

The previous prime is 166400371. The next prime is 166400383. The reversal of 166400379 is 973004661.

166400379 is a `hidden beast` number, since 1 + 6 + 640 + 0 + 3 + 7 + 9 = 666.

It is not a de Polignac number, because 166400379 - 2³ = 166400371 is a prime.

It is a super-2 number, since 2×166400379² = 55378172262687282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166400371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12154 + ... + 21920.

It is an arithmetic number, because the mean of its divisors is an integer number (15433440).

Almost surely, 2^166400379 is an apocalyptic number.

166400379 is a deficient number, since it is larger than the sum of its proper divisors (80534661).

166400379 is an equidigital number, since it uses as much as digits as its factorization.

166400379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10407 (or 10401 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 166400379 is about 12899.6270876332. The cubic root of 166400379 is about 550.0279644184.

The spelling of 166400379 in words is "one hundred sixty-six million, four hundred thousand, three hundred seventy-nine".