855507021844 has 12 divisors (see below), whose sum is σ = 1501307589600. Its totient is φ = 426561996248.

The previous prime is 855507021839. The next prime is 855507021851. The reversal of 855507021844 is 448120705558.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297877054 + ... + 297879925.

It is an arithmetic number, because the mean of its divisors is an integer number (125108965800).

Almost surely, 2^855507021844 is an apocalyptic number.

It is an amenable number.

855507021844 is a deficient number, since it is larger than the sum of its proper divisors (645800567756).

855507021844 is a wasteful number, since it uses less digits than its factorization.

855507021844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595757342 (or 595757340 counting only the distinct ones).

The product of its (nonzero) digits is 1792000, while the sum is 49.

The spelling of 855507021844 in words is "eight hundred fifty-five billion, five hundred seven million, twenty-one thousand, eight hundred forty-four".