656663651340 has 48 divisors (see below), whose sum is σ = 1866100895232. Its totient is φ = 172496719296.

The previous prime is 656663651323. The next prime is 656663651359. The reversal of 656663651340 is 43156366656.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81670564 + ... + 81678603.

It is an arithmetic number, because the mean of its divisors is an integer number (38877101984).

Almost surely, 2^656663651340 is an apocalyptic number.

656663651340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656663651340 is an abundant number, since it is smaller than the sum of its proper divisors (1209437243892).

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

656663651340 is a wasteful number, since it uses less digits than its factorization.

656663651340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163349246 (or 163349244 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 51.

The spelling of 656663651340 in words is "six hundred fifty-six billion, six hundred sixty-three million, six hundred fifty-one thousand, three hundred forty".