665131024913 has 2 divisors, whose sum is σ = 665131024914. Its totient is φ = 665131024912.

The previous prime is 665131024871. The next prime is 665131024927. The reversal of 665131024913 is 319420131566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581593840129 + 83537184784 = 762623^2 + 289028^2 .

It is a cyclic number.

It is not a de Polignac number, because 665131024913 - 2²² = 665126830609 is a prime.

It is not a weakly prime, because it can be changed into another prime (665131024973) 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 as a sum of consecutive naturals, namely, 332565512456 + 332565512457.

It is an arithmetic number, because the mean of its divisors is an integer number (332565512457).

Almost surely, 2^665131024913 is an apocalyptic number.

It is an amenable number.

665131024913 is a deficient number, since it is larger than the sum of its proper divisors (1).

665131024913 is an equidigital number, since it uses as much as digits as its factorization.

665131024913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 665131024913 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-four thousand, nine hundred thirteen".