863666216 has 16 divisors (see below), whose sum is σ = 1850713440. Its totient is φ = 370142640.

The previous prime is 863666191. The next prime is 863666239. The reversal of 863666216 is 612666368.

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, 7711250 + ... + 7711361.

It is an arithmetic number, because the mean of its divisors is an integer number (115669590).

Almost surely, 2^863666216 is an apocalyptic number.

It is an amenable number.

863666216 is an abundant number, since it is smaller than the sum of its proper divisors (987047224).

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

863666216 is a wasteful number, since it uses less digits than its factorization.

863666216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15422624 (or 15422620 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The square root of 863666216 is about 29388.1985837853. The cubic root of 863666216 is about 952.3179651350.

The spelling of 863666216 in words is "eight hundred sixty-three million, six hundred sixty-six thousand, two hundred sixteen".