863115666 has 32 divisors (see below), whose sum is σ = 1979883648. Its totient is φ = 245723520.

The previous prime is 863115637. The next prime is 863115667. The reversal of 863115666 is 666511368.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (863115667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24765 + ... + 48368.

It is an arithmetic number, because the mean of its divisors is an integer number (61871364).

Almost surely, 2^863115666 is an apocalyptic number.

863115666 is an abundant number, since it is smaller than the sum of its proper divisors (1116767982).

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

863115666 is a wasteful number, since it uses less digits than its factorization.

863115666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73426.

The product of its digits is 155520, while the sum is 42.

The square root of 863115666 is about 29378.8302353923. The cubic root of 863115666 is about 952.1155682323.

The spelling of 863115666 in words is "eight hundred sixty-three million, one hundred fifteen thousand, six hundred sixty-six".