861363516920 has 32 divisors (see below), whose sum is σ = 1965364650720. Its totient is φ = 339692653440.

The previous prime is 861363516859. The next prime is 861363516997. The reversal of 861363516920 is 29615363168.

It is a happy number.

It is a super-2 number, since 2×861363516920² (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, 151645667 + ... + 151651346.

It is an arithmetic number, because the mean of its divisors is an integer number (61417645335).

Almost surely, 2^861363516920 is an apocalyptic number.

It is an amenable number.

861363516920 is an abundant number, since it is smaller than the sum of its proper divisors (1104001133800).

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

861363516920 is a wasteful number, since it uses less digits than its factorization.

861363516920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303297095 (or 303297091 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 861363516920 in words is "eight hundred sixty-one billion, three hundred sixty-three million, five hundred sixteen thousand, nine hundred twenty".