664312663 has 4 divisors (see below), whose sum is σ = 759214480. Its totient is φ = 569410848.

The previous prime is 664312639. The next prime is 664312669. The reversal of 664312663 is 366213466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664312663 is a prime.

It is a super-2 number, since 2×664312663² = 882622628444303138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664312669) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 47450898 + ... + 47450911.

It is an arithmetic number, because the mean of its divisors is an integer number (189803620).

Almost surely, 2^664312663 is an apocalyptic number.

664312663 is a deficient number, since it is larger than the sum of its proper divisors (94901817).

664312663 is an equidigital number, since it uses as much as digits as its factorization.

664312663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94901816.

The product of its digits is 93312, while the sum is 37.

The square root of 664312663 is about 25774.2635782286. The cubic root of 664312663 is about 872.5510463480.

It can be divided in two parts, 6643 and 12663, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 664312663 in words is "six hundred sixty-four million, three hundred twelve thousand, six hundred sixty-three".