655588664640 has 2016 divisors, whose sum is σ = 3040707720960. Its totient is φ = 125889085440.

The previous prime is 655588664629. The next prime is 655588664663. The reversal of 655588664640 is 46466885556.

It is a happy number.

655588664640 is a `hidden beast` number, since 6 + 5 + 5 + 588 + 6 + 6 + 4 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (2016).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 4785318652 + ... + 4785318788.

It is an arithmetic number, because the mean of its divisors is an integer number (1508287560).

Almost surely, 2^655588664640 is an apocalyptic number.

655588664640 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 655588664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520353860480).

655588664640 is an abundant number, since it is smaller than the sum of its proper divisors (2385119056320).

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

655588664640 is a wasteful number, since it uses less digits than its factorization.

655588664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 165888000, while the sum is 63.

The spelling of 655588664640 in words is "six hundred fifty-five billion, five hundred eighty-eight million, six hundred sixty-four thousand, six hundred forty".