856642825290 has 64 divisors (see below), whose sum is σ = 2451807553536. Its totient is φ = 187290852672.

The previous prime is 856642825289. The next prime is 856642825307. The reversal of 856642825290 is 92528246658.

856642825290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 856642825290.

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, 88674552 + ... + 88684211.

It is an arithmetic number, because the mean of its divisors is an integer number (38309493024).

Almost surely, 2^856642825290 is an apocalyptic number.

856642825290 is an abundant number, since it is smaller than the sum of its proper divisors (1595164728246).

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

856642825290 is a wasteful number, since it uses less digits than its factorization.

856642825290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177358803.

The product of its (nonzero) digits is 16588800, while the sum is 57.

The spelling of 856642825290 in words is "eight hundred fifty-six billion, six hundred forty-two million, eight hundred twenty-five thousand, two hundred ninety".