656364226440 has 128 divisors (see below), whose sum is σ = 2124057922560. Its totient is φ = 161300173824.

The previous prime is 656364226367. The next prime is 656364226487. The reversal of 656364226440 is 44622463656.

It is a self number, because there is not a number n which added to its sum of digits gives 656364226440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 600342 + ... + 1293498.

It is an arithmetic number, because the mean of its divisors is an integer number (16594202520).

Almost surely, 2^656364226440 is an apocalyptic number.

656364226440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656364226440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062028961280).

656364226440 is an abundant number, since it is smaller than the sum of its proper divisors (1467693696120).

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

656364226440 is a wasteful number, since it uses less digits than its factorization.

656364226440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693791 (or 693787 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 48.

The spelling of 656364226440 in words is "six hundred fifty-six billion, three hundred sixty-four million, two hundred twenty-six thousand, four hundred forty".