661880854732 has 12 divisors (see below), whose sum is σ = 1158358806640. Its totient is φ = 330921195696.

The previous prime is 661880854717. The next prime is 661880854771. The reversal of 661880854732 is 237458088166.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4730343 + ... + 4868254.

Almost surely, 2^661880854732 is an apocalyptic number.

It is an amenable number.

661880854732 is a deficient number, since it is larger than the sum of its proper divisors (496477951908).

661880854732 is a wasteful number, since it uses less digits than its factorization.

661880854732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9615840 (or 9615838 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 661880854732 in words is "six hundred sixty-one billion, eight hundred eighty million, eight hundred fifty-four thousand, seven hundred thirty-two".