656877382440 has 64 divisors (see below), whose sum is σ = 2012560508160. Its totient is φ = 171440336640.

The previous prime is 656877382363. The next prime is 656877382547. The reversal of 656877382440 is 44283778656.

It is a happy number.

It is a super-2 number, since 2×656877382440² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58228171 + ... + 58239450.

It is an arithmetic number, because the mean of its divisors is an integer number (31446257940).

Almost surely, 2^656877382440 is an apocalyptic number.

656877382440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656877382440 is an abundant number, since it is smaller than the sum of its proper divisors (1355683125720).

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

656877382440 is a wasteful number, since it uses less digits than its factorization.

656877382440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116467682 (or 116467678 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 60.

The spelling of 656877382440 in words is "six hundred fifty-six billion, eight hundred seventy-seven million, three hundred eighty-two thousand, four hundred forty".