656487668680 has 16 divisors (see below), whose sum is σ = 1477097254620. Its totient is φ = 262595067456.

The previous prime is 656487668677. The next prime is 656487668687. The reversal of 656487668680 is 86866784656.

It can be written as a sum of positive squares in 2 ways, for example, as 525343737636 + 131143931044 = 724806^2 + 362138^2 .

It is not an unprimeable number, because it can be changed into a prime (656487668687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8206095819 + ... + 8206095898.

Almost surely, 2^656487668680 is an apocalyptic number.

It is an amenable number.

656487668680 is an abundant number, since it is smaller than the sum of its proper divisors (820609585940).

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

656487668680 is a wasteful number, since it uses less digits than its factorization.

656487668680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16412191728 (or 16412191724 counting only the distinct ones).

The product of its (nonzero) digits is 557383680, while the sum is 70.

The spelling of 656487668680 in words is "six hundred fifty-six billion, four hundred eighty-seven million, six hundred sixty-eight thousand, six hundred eighty".