664391300431 has 2 divisors, whose sum is σ = 664391300432. Its totient is φ = 664391300430.

The previous prime is 664391300411. The next prime is 664391300453. The reversal of 664391300431 is 134003193466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664391300431 - 2⁹ = 664391299919 is a prime.

It is a super-2 number, since 2×664391300431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664391300411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332195650215 + 332195650216.

It is an arithmetic number, because the mean of its divisors is an integer number (332195650216).

Almost surely, 2^664391300431 is an apocalyptic number.

664391300431 is a deficient number, since it is larger than the sum of its proper divisors (1).

664391300431 is an equidigital number, since it uses as much as digits as its factorization.

664391300431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 40.

Adding to 664391300431 its reverse (134003193466), we get a palindrome (798394493897).

The spelling of 664391300431 in words is "six hundred sixty-four billion, three hundred ninety-one million, three hundred thousand, four hundred thirty-one".