656213296128 has 264 divisors, whose sum is σ = 1934307704448. Its totient is φ = 197608439808.

The previous prime is 656213296103. The next prime is 656213296181. The reversal of 656213296128 is 821692312656.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24387450 + ... + 24414342.

Almost surely, 2^656213296128 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 656213296128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967153852224).

656213296128 is an abundant number, since it is smaller than the sum of its proper divisors (1278094408320).

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

656213296128 is a wasteful number, since it uses less digits than its factorization.

656213296128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26989 (or 26958 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The spelling of 656213296128 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred ninety-six thousand, one hundred twenty-eight".