664672869 has 12 divisors (see below), whose sum is σ = 1097237856. Its totient is φ = 379813032.

The previous prime is 664672867. The next prime is 664672871. The reversal of 664672869 is 968276466.

It is an interprime number because it is at equal distance from previous prime (664672867) and next prime (664672871).

It is not a de Polignac number, because 664672869 - 2¹ = 664672867 is a prime.

It is a super-2 number, since 2×664672869² = 883580045569382322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664672861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5275119 + ... + 5275244.

It is an arithmetic number, because the mean of its divisors is an integer number (91436488).

Almost surely, 2^664672869 is an apocalyptic number.

It is an amenable number.

664672869 is a deficient number, since it is larger than the sum of its proper divisors (432564987).

664672869 is a wasteful number, since it uses less digits than its factorization.

664672869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550376 (or 10550373 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 664672869 is about 25781.2503381818. The cubic root of 664672869 is about 872.7087237742.

The spelling of 664672869 in words is "six hundred sixty-four million, six hundred seventy-two thousand, eight hundred sixty-nine".