664040633 has 8 divisors (see below), whose sum is σ = 716039520. Its totient is φ = 613746720.

The previous prime is 664040623. The next prime is 664040687. The reversal of 664040633 is 336040466.

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 664040633 - 2⁴ = 664040617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 664040633.

It is not an unprimeable number, because it can be changed into a prime (664040623) 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, 425435 + ... + 426992.

It is an arithmetic number, because the mean of its divisors is an integer number (89504940).

Almost surely, 2^664040633 is an apocalyptic number.

It is an amenable number.

664040633 is a deficient number, since it is larger than the sum of its proper divisors (51998887).

664040633 is a wasteful number, since it uses less digits than its factorization.

664040633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852487.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 664040633 is about 25768.9858744965. The cubic root of 664040633 is about 872.4319295121.

The spelling of 664040633 in words is "six hundred sixty-four million, forty thousand, six hundred thirty-three".