851840745556 has 24 divisors (see below), whose sum is σ = 1494760458240. Its totient is φ = 424767434400.

The previous prime is 851840745521. The next prime is 851840745563. The reversal of 851840745556 is 655547048158.

It is a self number, because there is not a number n which added to its sum of digits gives 851840745556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2968701 + ... + 3242971.

It is an arithmetic number, because the mean of its divisors is an integer number (62281685760).

Almost surely, 2^851840745556 is an apocalyptic number.

It is an amenable number.

851840745556 is a deficient number, since it is larger than the sum of its proper divisors (642919712684).

851840745556 is a wasteful number, since it uses less digits than its factorization.

851840745556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276375 (or 276373 counting only the distinct ones).

The product of its (nonzero) digits is 26880000, while the sum is 58.

The spelling of 851840745556 in words is "eight hundred fifty-one billion, eight hundred forty million, seven hundred forty-five thousand, five hundred fifty-six".