664553859 has 16 divisors (see below), whose sum is σ = 898128000. Its totient is φ = 437024576.

The previous prime is 664553843. The next prime is 664553873. The reversal of 664553859 is 958355466.

It is a cyclic number.

It is not a de Polignac number, because 664553859 - 2⁴ = 664553843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664553359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199792 + ... + 203090.

It is an arithmetic number, because the mean of its divisors is an integer number (56133000).

Almost surely, 2^664553859 is an apocalyptic number.

664553859 is a deficient number, since it is larger than the sum of its proper divisors (233574141).

664553859 is a wasteful number, since it uses less digits than its factorization.

664553859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194.

The product of its digits is 3888000, while the sum is 51.

The square root of 664553859 is about 25778.9421621602. The cubic root of 664553859 is about 872.6566343583.

The spelling of 664553859 in words is "six hundred sixty-four million, five hundred fifty-three thousand, eight hundred fifty-nine".