856815001516280 has 128 divisors (see below), whose sum is σ = 1972694922727680. Its totient is φ = 334779512094720.

The previous prime is 856815001516231. The next prime is 856815001516339. The reversal of 856815001516280 is 82615100518658.

856815001516280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3550516904 + ... + 3550758216.

It is an arithmetic number, because the mean of its divisors is an integer number (15411679083810).

Almost surely, 2^{856815001516280} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856815001516280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986347461363840).

856815001516280 is an abundant number, since it is smaller than the sum of its proper divisors (1115879921211400).

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

856815001516280 is a wasteful number, since it uses less digits than its factorization.

856815001516280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245049 (or 245045 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 56.

The spelling of 856815001516280 in words is "eight hundred fifty-six trillion, eight hundred fifteen billion, one million, five hundred sixteen thousand, two hundred eighty".