856421247702800 has 120 divisors (see below), whose sum is σ = 2215844289404424. Its totient is φ = 316214363566080.

The previous prime is 856421247702799. The next prime is 856421247702851. The reversal of 856421247702800 is 8207742124658.

It can be written as a sum of positive squares in 12 ways, for example, as 15349094155264 + 841072153547536 = 3917792^2 + 29001244^2 .

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 666065324 + ... + 667349876.

Almost surely, 2^{856421247702800} is an apocalyptic number.

856421247702800 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

856421247702800 is an abundant number, since it is smaller than the sum of its proper divisors (1359423041701624).

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

856421247702800 is a wasteful number, since it uses less digits than its factorization.

856421247702800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412797 (or 1412786 counting only the distinct ones).

The product of its (nonzero) digits is 12042240, while the sum is 56.

The spelling of 856421247702800 in words is "eight hundred fifty-six trillion, four hundred twenty-one billion, two hundred forty-seven million, seven hundred two thousand, eight hundred".