855517423880 has 128 divisors (see below), whose sum is σ = 2248553260800. Its totient is φ = 286883939328.

The previous prime is 855517423819. The next prime is 855517423913. The reversal of 855517423880 is 88324715558.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3123002 + ... + 3385878.

It is an arithmetic number, because the mean of its divisors is an integer number (17566822350).

Almost surely, 2^855517423880 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 855517423880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124276630400).

855517423880 is an abundant number, since it is smaller than the sum of its proper divisors (1393035836920).

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

855517423880 is a wasteful number, since it uses less digits than its factorization.

855517423880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263151 (or 263147 counting only the distinct ones).

The product of its (nonzero) digits is 10752000, while the sum is 56.

The spelling of 855517423880 in words is "eight hundred fifty-five billion, five hundred seventeen million, four hundred twenty-three thousand, eight hundred eighty".