861706791792 has 120 divisors (see below), whose sum is σ = 3006647978880. Its totient is φ = 223819943040.

The previous prime is 861706791761. The next prime is 861706791793. The reversal of 861706791792 is 297197607168.

861706791792 is a `hidden beast` number, since 8 + 617 + 0 + 6 + 7 + 9 + 1 + 7 + 9 + 2 = 666.

It is a super-2 number, since 2×861706791792² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861706791793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38846542 + ... + 38868717.

It is an arithmetic number, because the mean of its divisors is an integer number (25055399824).

Almost surely, 2^861706791792 is an apocalyptic number.

It is an amenable number.

861706791792 is an abundant number, since it is smaller than the sum of its proper divisors (2144941187088).

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

861706791792 is a wasteful number, since it uses less digits than its factorization.

861706791792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77715291 (or 77715282 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 63.

The spelling of 861706791792 in words is "eight hundred sixty-one billion, seven hundred six million, seven hundred ninety-one thousand, seven hundred ninety-two".