856363868640 has 960 divisors, whose sum is σ = 3794043939840. Its totient is φ = 177367449600.

The previous prime is 856363868623. The next prime is 856363868653. The reversal of 856363868640 is 46868363658.

856363868640 is a `hidden beast` number, since 8 + 563 + 6 + 3 + 8 + 6 + 8 + 64 + 0 = 666.

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 159 ways as a sum of consecutive naturals, for example, 39633840 + ... + 39655440.

It is an arithmetic number, because the mean of its divisors is an integer number (3952129104).

Almost surely, 2^856363868640 is an apocalyptic number.

856363868640 is a gapful number since it is divisible by the number (80) 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 856363868640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897021969920).

856363868640 is an abundant number, since it is smaller than the sum of its proper divisors (2937680071200).

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

856363868640 is a wasteful number, since it uses less digits than its factorization.

856363868640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21677 (or 21660 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 63.

The spelling of 856363868640 in words is "eight hundred fifty-six billion, three hundred sixty-three million, eight hundred sixty-eight thousand, six hundred forty".