660204656 has 40 divisors (see below), whose sum is σ = 1358667504. Its totient is φ = 309703680.

The previous prime is 660204617. The next prime is 660204683. The reversal of 660204656 is 656402066.

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, 86366 + ... + 93698.

Almost surely, 2^660204656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660204656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679333752).

660204656 is an abundant number, since it is smaller than the sum of its proper divisors (698462848).

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

660204656 is a wasteful number, since it uses less digits than its factorization.

660204656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7689 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 660204656 is about 25694.4479606004. The cubic root of 660204656 is about 870.7487525147.

The spelling of 660204656 in words is "six hundred sixty million, two hundred four thousand, six hundred fifty-six".