851092861820 has 24 divisors (see below), whose sum is σ = 1793655502128. Its totient is φ = 339225622400.

The previous prime is 851092861811. The next prime is 851092861841. The reversal of 851092861820 is 28168290158.

851092861820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×851092861820² (a number of 25 digits) contains 22 as substring.

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, 75714386 + ... + 75725625.

It is an arithmetic number, because the mean of its divisors is an integer number (74735645922).

Almost surely, 2^851092861820 is an apocalyptic number.

It is an amenable number.

851092861820 is an abundant number, since it is smaller than the sum of its proper divisors (942562640308).

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

851092861820 is a wasteful number, since it uses less digits than its factorization.

851092861820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151440301 (or 151440299 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 851092861820 in words is "eight hundred fifty-one billion, ninety-two million, eight hundred sixty-one thousand, eight hundred twenty".