664365867 has 48 divisors (see below), whose sum is σ = 1029202944. Its totient is φ = 380318400.

The previous prime is 664365857. The next prime is 664365883. The reversal of 664365867 is 768563466.

It is not a de Polignac number, because 664365867 - 2⁴ = 664365851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664365857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483193 + ... + 484565.

It is an arithmetic number, because the mean of its divisors is an integer number (21441728).

Almost surely, 2^664365867 is an apocalyptic number.

664365867 is a deficient number, since it is larger than the sum of its proper divisors (364837077).

664365867 is a wasteful number, since it uses less digits than its factorization.

664365867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472 (or 1461 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The square root of 664365867 is about 25775.2956724069. The cubic root of 664365867 is about 872.5743395798.

The spelling of 664365867 in words is "six hundred sixty-four million, three hundred sixty-five thousand, eight hundred sixty-seven".