656601115500 has 432 divisors, whose sum is σ = 2325314339712. Its totient is φ = 155783232000.

The previous prime is 656601115439. The next prime is 656601115543. The reversal of 656601115500 is 5511106656.

It is a super-3 number, since 3×656601115500³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 25578672 + ... + 25604328.

Almost surely, 2^656601115500 is an apocalyptic number.

656601115500 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 656601115500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1162657169856).

656601115500 is an abundant number, since it is smaller than the sum of its proper divisors (1668713224212).

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

656601115500 is a wasteful number, since it uses less digits than its factorization.

656601115500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25751 (or 25725 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 656601115500 in words is "six hundred fifty-six billion, six hundred one million, one hundred fifteen thousand, five hundred".