663718339 has 4 divisors (see below), whose sum is σ = 685128640. Its totient is φ = 642308040.

The previous prime is 663718327. The next prime is 663718379. The reversal of 663718339 is 933817366.

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 663718339 - 2⁹ = 663717827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663718379) 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, 10705104 + ... + 10705165.

It is an arithmetic number, because the mean of its divisors is an integer number (171282160).

Almost surely, 2^663718339 is an apocalyptic number.

663718339 is a deficient number, since it is larger than the sum of its proper divisors (21410301).

663718339 is a wasteful number, since it uses less digits than its factorization.

663718339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21410300.

The product of its digits is 489888, while the sum is 46.

The square root of 663718339 is about 25762.7315904195. The cubic root of 663718339 is about 872.2907609023.

It can be divided in two parts, 6637 and 18339, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 663718339 in words is "six hundred sixty-three million, seven hundred eighteen thousand, three hundred thirty-nine".