664986311 has 8 divisors (see below), whose sum is σ = 745046544. Its totient is φ = 588193920.

The previous prime is 664986307. The next prime is 664986319. The reversal of 664986311 is 113689466.

It is a happy number.

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 664986311 - 2² = 664986307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664986319) 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, 816530 + ... + 817343.

It is an arithmetic number, because the mean of its divisors is an integer number (93130818).

Almost surely, 2^664986311 is an apocalyptic number.

664986311 is a deficient number, since it is larger than the sum of its proper divisors (80060233).

664986311 is a wasteful number, since it uses less digits than its factorization.

664986311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633921.

The product of its digits is 186624, while the sum is 44.

The square root of 664986311 is about 25787.3284967637. The cubic root of 664986311 is about 872.8458842698.

The spelling of 664986311 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, three hundred eleven".