664662859 has 4 divisors (see below), whose sum is σ = 759614704. Its totient is φ = 569711016.

The previous prime is 664662853. The next prime is 664662863. The reversal of 664662859 is 958266466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958266466 = 2 ⋅479133233.

It is not a de Polignac number, because 664662859 - 2⁵ = 664662827 is a prime.

It is a super-2 number, since 2×664662859² = 883553432268107762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664662853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47475912 + ... + 47475925.

It is an arithmetic number, because the mean of its divisors is an integer number (189903676).

Almost surely, 2^664662859 is an apocalyptic number.

664662859 is a deficient number, since it is larger than the sum of its proper divisors (94951845).

664662859 is an equidigital number, since it uses as much as digits as its factorization.

664662859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94951844.

The product of its digits is 3732480, while the sum is 52.

The square root of 664662859 is about 25781.0562041201. The cubic root of 664662859 is about 872.7043427428.

The spelling of 664662859 in words is "six hundred sixty-four million, six hundred sixty-two thousand, eight hundred fifty-nine".