655663760640 has 864 divisors, whose sum is σ = 2700206675712. Its totient is φ = 143769600000.

The previous prime is 655663760627. The next prime is 655663760669. The reversal of 655663760640 is 46067366556.

655663760640 is a `hidden beast` number, since 6 + 5 + 566 + 3 + 76 + 0 + 6 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 201679015 + ... + 201682265.

It is an arithmetic number, because the mean of its divisors is an integer number (3125239208).

Almost surely, 2^655663760640 is an apocalyptic number.

655663760640 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 655663760640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1350103337856).

655663760640 is an abundant number, since it is smaller than the sum of its proper divisors (2044542915072).

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

655663760640 is a wasteful number, since it uses less digits than its factorization.

655663760640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387 (or 3370 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 655663760640 in words is "six hundred fifty-five billion, six hundred sixty-three million, seven hundred sixty thousand, six hundred forty".