851709126320 has 40 divisors (see below), whose sum is σ = 2132548622736. Its totient is φ = 314477215488.

The previous prime is 851709126311. The next prime is 851709126377. The reversal of 851709126320 is 23621907158.

851709126320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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, 409474502 + ... + 409476581.

Almost surely, 2^851709126320 is an apocalyptic number.

851709126320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

851709126320 is an abundant number, since it is smaller than the sum of its proper divisors (1280839496416).

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

851709126320 is a wasteful number, since it uses less digits than its factorization.

851709126320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818951109 (or 818951103 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 851709126320 in words is "eight hundred fifty-one billion, seven hundred nine million, one hundred twenty-six thousand, three hundred twenty".