166678474 has 12 divisors (see below), whose sum is σ = 254194902. Its totient is φ = 81969360.

The previous prime is 166678459. The next prime is 166678487. The reversal of 166678474 is 474876661.

It can be written as a sum of positive squares in 3 ways, for example, as 97871449 + 68807025 = 9893^2 + 8295^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3757 + ... + 18640.

Almost surely, 2^166678474 is an apocalyptic number.

166678474 is a deficient number, since it is larger than the sum of its proper divisors (87516428).

166678474 is an equidigital number, since it uses as much as digits as its factorization.

166678474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22521 (or 22460 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 49.

The square root of 166678474 is about 12910.4017753128. The cubic root of 166678474 is about 550.3342034941.

The spelling of 166678474 in words is "one hundred sixty-six million, six hundred seventy-eight thousand, four hundred seventy-four".