166431394 has 8 divisors (see below), whose sum is σ = 264332268. Its totient is φ = 78320640.

The previous prime is 166431373. The next prime is 166431403. The reversal of 166431394 is 493134661.

166431394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149744169 + 16687225 = 12237^2 + 4085^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2447487 + ... + 2447554.

Almost surely, 2^166431394 is an apocalyptic number.

166431394 is a deficient number, since it is larger than the sum of its proper divisors (97900874).

166431394 is a wasteful number, since it uses less digits than its factorization.

166431394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4895060.

The product of its digits is 46656, while the sum is 37.

The square root of 166431394 is about 12900.8291981562. The cubic root of 166431394 is about 550.0621351289.

The spelling of 166431394 in words is "one hundred sixty-six million, four hundred thirty-one thousand, three hundred ninety-four".