660173994 has 12 divisors (see below), whose sum is σ = 1430377026. Its totient is φ = 220057992.

The previous prime is 660173993. The next prime is 660173999. The reversal of 660173994 is 499371066.

660173994 is a `hidden beast` number, since 6 + 601 + 7 + 39 + 9 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 375003225 + 285170769 = 19365^2 + 16887^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (660173993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18338149 + ... + 18338184.

Almost surely, 2^660173994 is an apocalyptic number.

660173994 is an abundant number, since it is smaller than the sum of its proper divisors (770203032).

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

660173994 is a wasteful number, since it uses less digits than its factorization.

660173994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36676341 (or 36676338 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 660173994 is about 25693.8512878081. The cubic root of 660173994 is about 870.7352721939.

The spelling of 660173994 in words is "six hundred sixty million, one hundred seventy-three thousand, nine hundred ninety-four".