661042056 has 32 divisors (see below), whose sum is σ = 1654529760. Its totient is φ = 220090752.

The previous prime is 661042001. The next prime is 661042061. The reversal of 661042056 is 650240166.

661042056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 5596 + ... + 36788.

It is an arithmetic number, because the mean of its divisors is an integer number (51704055).

Almost surely, 2^661042056 is an apocalyptic number.

It is an amenable number.

661042056 is an abundant number, since it is smaller than the sum of its proper divisors (993487704).

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

661042056 is a wasteful number, since it uses less digits than its factorization.

661042056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32085 (or 32081 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 661042056 is about 25710.7381457631. The cubic root of 661042056 is about 871.1167479669.

The spelling of 661042056 in words is "six hundred sixty-one million, forty-two thousand, fifty-six".