664986611 has 8 divisors (see below), whose sum is σ = 690278400. Its totient is φ = 639934920.

The previous prime is 664986587. The next prime is 664986631. The reversal of 664986611 is 116689466.

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 664986611 - 2²⁶ = 597877747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664986631) 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, 54371 + ... + 65468.

It is an arithmetic number, because the mean of its divisors is an integer number (86284800).

Almost surely, 2^664986611 is an apocalyptic number.

664986611 is a deficient number, since it is larger than the sum of its proper divisors (25291789).

664986611 is a wasteful number, since it uses less digits than its factorization.

664986611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120049.

The product of its digits is 373248, while the sum is 47.

The square root of 664986611 is about 25787.3343135734. The cubic root of 664986611 is about 872.8460155275.

The spelling of 664986611 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, six hundred eleven".