861984664 has 16 divisors (see below), whose sum is σ = 1617838200. Its totient is φ = 430561152.

The previous prime is 861984637. The next prime is 861984691. The reversal of 861984664 is 466489168.

861984664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (861984637) and next prime (861984691).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45322 + ... + 61465.

Almost surely, 2^861984664 is an apocalyptic number.

It is an amenable number.

861984664 is a deficient number, since it is larger than the sum of its proper divisors (755853536).

861984664 is a wasteful number, since it uses less digits than its factorization.

861984664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107802 (or 107798 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 52.

The square root of 861984664 is about 29359.5753375283. The cubic root of 861984664 is about 951.6995114771.

The spelling of 861984664 in words is "eight hundred sixty-one million, nine hundred eighty-four thousand, six hundred sixty-four".