851242778120 has 64 divisors (see below), whose sum is σ = 2304115804800. Its totient is φ = 276493893120.

The previous prime is 851242778117. The next prime is 851242778143. The reversal of 851242778120 is 21877242158.

It is a super-2 number, since 2×851242778120² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79998701 + ... + 80009340.

It is an arithmetic number, because the mean of its divisors is an integer number (36001809450).

Almost surely, 2^851242778120 is an apocalyptic number.

It is an amenable number.

851242778120 is an abundant number, since it is smaller than the sum of its proper divisors (1452873026680).

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

851242778120 is a wasteful number, since it uses less digits than its factorization.

851242778120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160008078 (or 160008074 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 47.

The spelling of 851242778120 in words is "eight hundred fifty-one billion, two hundred forty-two million, seven hundred seventy-eight thousand, one hundred twenty".