851964220798 has 4 divisors (see below), whose sum is σ = 1277946331200. Its totient is φ = 425982110398.

The previous prime is 851964220787. The next prime is 851964220829. The reversal of 851964220798 is 897022469158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 897022469158 = 2 ⋅448511234579.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212991055198 + ... + 212991055201.

It is an arithmetic number, because the mean of its divisors is an integer number (319486582800).

Almost surely, 2^851964220798 is an apocalyptic number.

851964220798 is a deficient number, since it is larger than the sum of its proper divisors (425982110402).

851964220798 is a wasteful number, since it uses less digits than its factorization.

851964220798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425982110401.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 851964220798 in words is "eight hundred fifty-one billion, nine hundred sixty-four million, two hundred twenty thousand, seven hundred ninety-eight".