166561312 has 24 divisors (see below), whose sum is σ = 330319836. Its totient is φ = 82670592.

The previous prime is 166561301. The next prime is 166561313. The reversal of 166561312 is 213165661.

It can be written as a sum of positive squares in 2 ways, for example, as 153859216 + 12702096 = 12404^2 + 3564^2 .

It is a super-2 number, since 2×166561312² = 55485341310322688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166561313) 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, 14613 + ... + 23380.

Almost surely, 2^166561312 is an apocalyptic number.

It is an amenable number.

166561312 is a deficient number, since it is larger than the sum of its proper divisors (163758524).

166561312 is a wasteful number, since it uses less digits than its factorization.

166561312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38140 (or 38132 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 166561312 is about 12905.8634736309. The cubic root of 166561312 is about 550.2052258922.

The spelling of 166561312 in words is "one hundred sixty-six million, five hundred sixty-one thousand, three hundred twelve".