864809966 has 16 divisors (see below), whose sum is σ = 1398796560. Its totient is φ = 399654720.

The previous prime is 864809963. The next prime is 864809969. The reversal of 864809966 is 669908468.

It is an interprime number because it is at equal distance from previous prime (864809963) and next prime (864809969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864809963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275981 + ... + 279096.

It is an arithmetic number, because the mean of its divisors is an integer number (87424785).

Almost surely, 2^864809966 is an apocalyptic number.

864809966 is a deficient number, since it is larger than the sum of its proper divisors (533986594).

864809966 is a wasteful number, since it uses less digits than its factorization.

864809966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555139.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The square root of 864809966 is about 29407.6514873255. The cubic root of 864809966 is about 952.7381634292.

The spelling of 864809966 in words is "eight hundred sixty-four million, eight hundred nine thousand, nine hundred sixty-six".