861918945914 has 24 divisors (see below), whose sum is σ = 1410052654080. Its totient is φ = 394946789328.

The previous prime is 861918945911. The next prime is 861918945983. The reversal of 861918945914 is 419549819168.

It is not an unprimeable number, because it can be changed into a prime (861918945911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9125882 + ... + 9219845.

It is an arithmetic number, because the mean of its divisors is an integer number (58752193920).

Almost surely, 2^861918945914 is an apocalyptic number.

861918945914 is a deficient number, since it is larger than the sum of its proper divisors (548133708166).

861918945914 is a wasteful number, since it uses less digits than its factorization.

861918945914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18345894 (or 18345881 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 65.

The spelling of 861918945914 in words is "eight hundred sixty-one billion, nine hundred eighteen million, nine hundred forty-five thousand, nine hundred fourteen".