166400418 has 8 divisors (see below), whose sum is σ = 332800848. Its totient is φ = 55466804.

The previous prime is 166400413. The next prime is 166400419. The reversal of 166400418 is 814004661.

It is a sphenic number, since it is the product of 3 distinct primes.

166400418 is an admirable number.

It is a super-2 number, since 2×166400418² = 55378198221149448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166400413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13866696 + ... + 13866707.

It is an arithmetic number, because the mean of its divisors is an integer number (41600106).

Almost surely, 2^166400418 is an apocalyptic number.

166400418 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166400418 is a wasteful number, since it uses less digits than its factorization.

166400418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27733408.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 166400418 is about 12899.6285993047. The cubic root of 166400418 is about 550.0280073892.

The spelling of 166400418 in words is "one hundred sixty-six million, four hundred thousand, four hundred eighteen".