660109974 has 16 divisors (see below), whose sum is σ = 1335054960. Its totient is φ = 217564160.

The previous prime is 660109927. The next prime is 660109981. The reversal of 660109974 is 479901066.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617547 + ... + 618614.

It is an arithmetic number, because the mean of its divisors is an integer number (83440935).

Almost surely, 2^660109974 is an apocalyptic number.

660109974 is an abundant number, since it is smaller than the sum of its proper divisors (674944986).

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

660109974 is a wasteful number, since it uses less digits than its factorization.

660109974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236255.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 660109974 is about 25692.6054342490. The cubic root of 660109974 is about 870.7071249304.

The spelling of 660109974 in words is "six hundred sixty million, one hundred nine thousand, nine hundred seventy-four".