664387853 has 8 divisors (see below), whose sum is σ = 672413280. Its totient is φ = 656407440.

The previous prime is 664387813. The next prime is 664387943. The reversal of 664387853 is 358783466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664387853 - 2⁸ = 664387597 is a prime.

It is a super-2 number, since 2×664387853² = 882822438427899218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664387813) 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, 18926 + ... + 41072.

It is an arithmetic number, because the mean of its divisors is an integer number (84051660).

Almost surely, 2^664387853 is an apocalyptic number.

It is an amenable number.

664387853 is a deficient number, since it is larger than the sum of its proper divisors (8025427).

664387853 is a wasteful number, since it uses less digits than its factorization.

664387853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22507.

The product of its digits is 2903040, while the sum is 50.

The square root of 664387853 is about 25775.7221625312. The cubic root of 664387853 is about 872.5839649026.

The spelling of 664387853 in words is "six hundred sixty-four million, three hundred eighty-seven thousand, eight hundred fifty-three".