655855985664 has 352 divisors, whose sum is σ = 2125159372800. Its totient is φ = 198157639680.

The previous prime is 655855985663. The next prime is 655855985723. The reversal of 655855985664 is 466589558556.

655855985664 is a `hidden beast` number, since 6 + 5 + 5 + 8 + 5 + 59 + 8 + 566 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (352).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 655855985592 and 655855985601.

It is not an unprimeable number, because it can be changed into a prime (655855985663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109178949 + ... + 109184955.

Almost surely, 2^655855985664 is an apocalyptic number.

655855985664 is a gapful number since it is divisible by the number (64) 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 655855985664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062579686400).

655855985664 is an abundant number, since it is smaller than the sum of its proper divisors (1469303387136).

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

655855985664 is a wasteful number, since it uses less digits than its factorization.

655855985664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6406 (or 6382 counting only the distinct ones).

The product of its digits is 1555200000, while the sum is 72.

The spelling of 655855985664 in words is "six hundred fifty-five billion, eight hundred fifty-five million, nine hundred eighty-five thousand, six hundred sixty-four".