656800881660 has 1440 divisors, whose sum is σ = 2818300915584. Its totient is φ = 124814131200.

The previous prime is 656800881641. The next prime is 656800881691. The reversal of 656800881660 is 66188008656.

It is a happy number.

656800881660 is a `hidden beast` number, since 6 + 568 + 0 + 0 + 8 + 8 + 16 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 656800881597 and 656800881606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 863075680 + ... + 863076440.

Almost surely, 2^656800881660 is an apocalyptic number.

656800881660 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 656800881660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1409150457792).

656800881660 is an abundant number, since it is smaller than the sum of its proper divisors (2161500033924).

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

656800881660 is a wasteful number, since it uses less digits than its factorization.

656800881660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 656800881660 in words is "six hundred fifty-six billion, eight hundred million, eight hundred eighty-one thousand, six hundred sixty".