660904042 has 4 divisors (see below), whose sum is σ = 991356066. Its totient is φ = 330452020.

The previous prime is 660904033. The next prime is 660904061. The reversal of 660904042 is 240409066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 406788561 + 254115481 = 20169^2 + 15941^2 .

It is a junction number, because it is equal to n+sod(n) for n = 660903995 and 660904013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165226009 + ... + 165226012.

Almost surely, 2^660904042 is an apocalyptic number.

660904042 is a deficient number, since it is larger than the sum of its proper divisors (330452024).

660904042 is a wasteful number, since it uses less digits than its factorization.

660904042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330452023.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 660904042 is about 25708.0540298172. The cubic root of 660904042 is about 871.0561191088.

The spelling of 660904042 in words is "six hundred sixty million, nine hundred four thousand, forty-two".