661848712 has 16 divisors (see below), whose sum is σ = 1418247360. Its totient is φ = 283649424.

The previous prime is 661848697. The next prime is 661848721. The reversal of 661848712 is 217848166.

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, 5909308 + ... + 5909419.

It is an arithmetic number, because the mean of its divisors is an integer number (88640460).

Almost surely, 2^661848712 is an apocalyptic number.

It is an amenable number.

661848712 is an abundant number, since it is smaller than the sum of its proper divisors (756398648).

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

661848712 is a wasteful number, since it uses less digits than its factorization.

661848712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11818740 (or 11818736 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 661848712 is about 25726.4205049984. The cubic root of 661848712 is about 871.4709392078.

The spelling of 661848712 in words is "six hundred sixty-one million, eight hundred forty-eight thousand, seven hundred twelve".