656224064040 has 64 divisors (see below), whose sum is σ = 1968942648960. Its totient is φ = 174969043200.

The previous prime is 656224064033. The next prime is 656224064077. The reversal of 656224064040 is 40460422656.

It is a super-2 number, since 2×656224064040² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 656224064040.

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, 510162 + ... + 1254078.

It is an arithmetic number, because the mean of its divisors is an integer number (30764728890).

Almost surely, 2^656224064040 is an apocalyptic number.

656224064040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656224064040 is an abundant number, since it is smaller than the sum of its proper divisors (1312718584920).

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

656224064040 is a wasteful number, since it uses less digits than its factorization.

656224064040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751282 (or 751278 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

Adding to 656224064040 its reverse (40460422656), we get a palindrome (696684486696).

The spelling of 656224064040 in words is "six hundred fifty-six billion, two hundred twenty-four million, sixty-four thousand, forty".