664311655 has 16 divisors (see below), whose sum is σ = 925994304. Its totient is φ = 448058880.

The previous prime is 664311623. The next prime is 664311667. The reversal of 664311655 is 556113466.

It is not a de Polignac number, because 664311655 - 2⁵ = 664311623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153442 + ... + 157711.

It is an arithmetic number, because the mean of its divisors is an integer number (57874644).

Almost surely, 2^664311655 is an apocalyptic number.

664311655 is a deficient number, since it is larger than the sum of its proper divisors (261682649).

664311655 is a wasteful number, since it uses less digits than its factorization.

664311655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311226.

The product of its digits is 64800, while the sum is 37.

The square root of 664311655 is about 25774.2440238312. The cubic root of 664311655 is about 872.5506050237.

It can be divided in two parts, 66431 and 1655, that added together give a palindrome (68086).

The spelling of 664311655 in words is "six hundred sixty-four million, three hundred eleven thousand, six hundred fifty-five".