665127873317 has 2 divisors, whose sum is σ = 665127873318. Its totient is φ = 665127873316.

The previous prime is 665127873239. The next prime is 665127873349. The reversal of 665127873317 is 713378721566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336493966561 + 328633906756 = 580081^2 + 573266^2 .

It is a cyclic number.

It is not a de Polignac number, because 665127873317 - 2⁸ = 665127873061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665127873367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332563936658 + 332563936659.

It is an arithmetic number, because the mean of its divisors is an integer number (332563936659).

Almost surely, 2^665127873317 is an apocalyptic number.

It is an amenable number.

665127873317 is a deficient number, since it is larger than the sum of its proper divisors (1).

665127873317 is an equidigital number, since it uses as much as digits as its factorization.

665127873317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8890560, while the sum is 56.

The spelling of 665127873317 in words is "six hundred sixty-five billion, one hundred twenty-seven million, eight hundred seventy-three thousand, three hundred seventeen".