851783021117 has 16 divisors (see below), whose sum is σ = 997258856832. Its totient is φ = 712257089280.

The previous prime is 851783021087. The next prime is 851783021153. The reversal of 851783021117 is 711120387158.

851783021117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 851783021117 - 2⁶ = 851783021053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851783024117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6857153 + ... + 6980265.

It is an arithmetic number, because the mean of its divisors is an integer number (62328678552).

Almost surely, 2^851783021117 is an apocalyptic number.

It is an amenable number.

851783021117 is a deficient number, since it is larger than the sum of its proper divisors (145475835715).

851783021117 is a wasteful number, since it uses less digits than its factorization.

851783021117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147268.

The product of its (nonzero) digits is 94080, while the sum is 44.

The spelling of 851783021117 in words is "eight hundred fifty-one billion, seven hundred eighty-three million, twenty-one thousand, one hundred seventeen".