660108088656 has 180 divisors, whose sum is σ = 2031190784532. Its totient is φ = 207092173824.

The previous prime is 660108088637. The next prime is 660108088667. The reversal of 660108088656 is 656880801066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 599633409600 + 60474679056 = 774360^2 + 245916^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1599646 + ... + 1969538.

Almost surely, 2^660108088656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660108088656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015595392266).

660108088656 is an abundant number, since it is smaller than the sum of its proper divisors (1371082695876).

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

660108088656 is an equidigital number, since it uses as much as digits as its factorization.

660108088656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369942 (or 369915 counting only the distinct ones).

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

The spelling of 660108088656 in words is "six hundred sixty billion, one hundred eight million, eighty-eight thousand, six hundred fifty-six".