656663651420 has 192 divisors, whose sum is σ = 1686162272256. Its totient is φ = 209908807680.

The previous prime is 656663651419. The next prime is 656663651437. The reversal of 656663651420 is 24156366656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 243839594 + ... + 243842286.

It is an arithmetic number, because the mean of its divisors is an integer number (8782095168).

Almost surely, 2^656663651420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656663651420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843081136128).

656663651420 is an abundant number, since it is smaller than the sum of its proper divisors (1029498620836).

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

656663651420 is a wasteful number, since it uses less digits than its factorization.

656663651420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620 (or 4618 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 656663651420 in words is "six hundred fifty-six billion, six hundred sixty-three million, six hundred fifty-one thousand, four hundred twenty".