664390394231 has 16 divisors (see below), whose sum is σ = 692918673408. Its totient is φ = 636313536000.

The previous prime is 664390394207. The next prime is 664390394237. The reversal of 664390394231 is 132493093466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664390394231 is a prime.

It is a super-2 number, since 2×664390394231² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664390394231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664390394237) 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 15 ways as a sum of consecutive naturals, for example, 5047010 + ... + 5176976.

It is an arithmetic number, because the mean of its divisors is an integer number (43307417088).

Almost surely, 2^664390394231 is an apocalyptic number.

664390394231 is a deficient number, since it is larger than the sum of its proper divisors (28528279177).

664390394231 is a wasteful number, since it uses less digits than its factorization.

664390394231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131702.

The product of its (nonzero) digits is 2519424, while the sum is 50.

The spelling of 664390394231 in words is "six hundred sixty-four billion, three hundred ninety million, three hundred ninety-four thousand, two hundred thirty-one".