655863998400 has 1512 divisors, whose sum is σ = 2771696818800. Its totient is φ = 151608360960.

The previous prime is 655863998399. The next prime is 655863998411. The reversal of 655863998400 is 4899368556.

655863998400 is a `hidden beast` number, since 6 + 5 + 586 + 3 + 9 + 9 + 8 + 40 + 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 (17) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1460721376 + ... + 1460721824.

Almost surely, 2^655863998400 is an apocalyptic number.

655863998400 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 655863998400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385848409400).

655863998400 is an abundant number, since it is smaller than the sum of its proper divisors (2115832820400).

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

655863998400 is a wasteful number, since it uses less digits than its factorization.

655863998400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 655863998400 in words is "six hundred fifty-five billion, eight hundred sixty-three million, nine hundred ninety-eight thousand, four hundred".