851930855591 has 8 divisors (see below), whose sum is σ = 860507625600. Its totient is φ = 843365470968.

The previous prime is 851930855561. The next prime is 851930855603. The reversal of 851930855591 is 195558039158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851930855591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851930855591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851930855561) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2695901 + ... + 2995286.

It is an arithmetic number, because the mean of its divisors is an integer number (107563453200).

Almost surely, 2^851930855591 is an apocalyptic number.

851930855591 is a deficient number, since it is larger than the sum of its proper divisors (8576770009).

851930855591 is a wasteful number, since it uses less digits than its factorization.

851930855591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692693.

The product of its (nonzero) digits is 9720000, while the sum is 59.

The spelling of 851930855591 in words is "eight hundred fifty-one billion, nine hundred thirty million, eight hundred fifty-five thousand, five hundred ninety-one".