866349664 has 24 divisors (see below), whose sum is σ = 1731087288. Its totient is φ = 426708480.

The previous prime is 866349647. The next prime is 866349667. The reversal of 866349664 is 466943668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866349667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199897 + ... + 204184.

It is an arithmetic number, because the mean of its divisors is an integer number (72128637).

Almost surely, 2^866349664 is an apocalyptic number.

It is an amenable number.

866349664 is a deficient number, since it is larger than the sum of its proper divisors (864737624).

866349664 is a wasteful number, since it uses less digits than its factorization.

866349664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404158 (or 404150 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 52.

The square root of 866349664 is about 29433.8183727494. The cubic root of 866349664 is about 953.3032430013.

The spelling of 866349664 in words is "eight hundred sixty-six million, three hundred forty-nine thousand, six hundred sixty-four".