656775336720 has 320 divisors, whose sum is σ = 2120636770560. Its totient is φ = 168032600064.

The previous prime is 656775336671. The next prime is 656775336757. The reversal of 656775336720 is 27633577656.

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, 137140086 + ... + 137144874.

It is an arithmetic number, because the mean of its divisors is an integer number (6626989908).

Almost surely, 2^656775336720 is an apocalyptic number.

656775336720 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 656775336720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060318385280).

656775336720 is an abundant number, since it is smaller than the sum of its proper divisors (1463861433840).

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

656775336720 is a wasteful number, since it uses less digits than its factorization.

656775336720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5082 (or 5076 counting only the distinct ones).

The product of its (nonzero) digits is 33339600, while the sum is 57.

The spelling of 656775336720 in words is "six hundred fifty-six billion, seven hundred seventy-five million, three hundred thirty-six thousand, seven hundred twenty".