665131535329 has 2 divisors, whose sum is σ = 665131535330. Its totient is φ = 665131535328.

The previous prime is 665131535291. The next prime is 665131535389. The reversal of 665131535329 is 923535131566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665097336225 + 34199104 = 815535^2 + 5848^2 .

It is a cyclic number.

It is not a de Polignac number, because 665131535329 - 2²⁹ = 664594664417 is a prime.

It is a super-2 number, since 2×665131535329² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (665131535389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332565767664 + 332565767665.

It is an arithmetic number, because the mean of its divisors is an integer number (332565767665).

Almost surely, 2^665131535329 is an apocalyptic number.

It is an amenable number.

665131535329 is a deficient number, since it is larger than the sum of its proper divisors (1).

665131535329 is an equidigital number, since it uses as much as digits as its factorization.

665131535329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2187000, while the sum is 49.

The spelling of 665131535329 in words is "six hundred sixty-five billion, one hundred thirty-one million, five hundred thirty-five thousand, three hundred twenty-nine".