656213215560 has 192 divisors, whose sum is σ = 2317642891200. Its totient is φ = 148184354304.

The previous prime is 656213215549. The next prime is 656213215571. The reversal of 656213215560 is 65512312656.

It is an interprime number because it is at equal distance from previous prime (656213215549) and next prime (656213215571).

It is a super-2 number, since 2×656213215560² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 184255 + ... + 1160334.

It is an arithmetic number, because the mean of its divisors is an integer number (12071056725).

Almost surely, 2^656213215560 is an apocalyptic number.

656213215560 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 656213215560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158821445600).

656213215560 is an abundant number, since it is smaller than the sum of its proper divisors (1661429675640).

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

656213215560 is a wasteful number, since it uses less digits than its factorization.

656213215560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344700 (or 1344689 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 656213215560 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred fifteen thousand, five hundred sixty".