664115899 has 4 divisors (see below), whose sum is σ = 664232464. Its totient is φ = 663999336.

The previous prime is 664115861. The next prime is 664115929. The reversal of 664115899 is 998511466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664115899 - 2¹³ = 664107707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664115839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49272 + ... + 61285.

It is an arithmetic number, because the mean of its divisors is an integer number (166058116).

Almost surely, 2^664115899 is an apocalyptic number.

664115899 is a deficient number, since it is larger than the sum of its proper divisors (116565).

664115899 is a wasteful number, since it uses less digits than its factorization.

664115899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116564.

The product of its digits is 466560, while the sum is 49.

The square root of 664115899 is about 25770.4462320698. The cubic root of 664115899 is about 872.4648903369.

The spelling of 664115899 in words is "six hundred sixty-four million, one hundred fifteen thousand, eight hundred ninety-nine".