655710660 has 192 divisors, whose sum is σ = 2264371200. Its totient is φ = 156182400.

The previous prime is 655710617. The next prime is 655710661. The reversal of 655710660 is 66017556.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (655710661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 349525 + ... + 351395.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^655710660 is an apocalyptic number.

655710660 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 655710660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132185600).

655710660 is an abundant number, since it is smaller than the sum of its proper divisors (1608660540).

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

655710660 is a wasteful number, since it uses less digits than its factorization.

655710660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959 (or 1951 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 655710660 is about 25606.8479122285. The cubic root of 655710660 is about 868.7685311852.

The spelling of 655710660 in words is "six hundred fifty-five million, seven hundred ten thousand, six hundred sixty".