656990753520 has 160 divisors (see below), whose sum is σ = 2087438895360. Its totient is φ = 170834913280.

The previous prime is 656990753491. The next prime is 656990753563. The reversal of 656990753520 is 25357099656.

It is a congruent number.

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, 19929211 + ... + 19962149.

It is an arithmetic number, because the mean of its divisors is an integer number (13046493096).

Almost surely, 2^656990753520 is an apocalyptic number.

656990753520 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 656990753520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043719447680).

656990753520 is an abundant number, since it is smaller than the sum of its proper divisors (1430448141840).

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

656990753520 is a wasteful number, since it uses less digits than its factorization.

656990753520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35023 (or 35017 counting only the distinct ones).

The product of its (nonzero) digits is 15309000, while the sum is 57.

The spelling of 656990753520 in words is "six hundred fifty-six billion, nine hundred ninety million, seven hundred fifty-three thousand, five hundred twenty".