665126254669 has 2 divisors, whose sum is σ = 665126254670. Its totient is φ = 665126254668.

The previous prime is 665126254621. The next prime is 665126254693. The reversal of 665126254669 is 966452621566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661757845225 + 3368409444 = 813485^2 + 58038^2 .

It is a cyclic number.

It is not a de Polignac number, because 665126254669 - 2¹¹ = 665126252621 is a prime.

It is a super-2 number, since 2×665126254669² (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 (665126224669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332563127334 + 332563127335.

It is an arithmetic number, because the mean of its divisors is an integer number (332563127335).

Almost surely, 2^665126254669 is an apocalyptic number.

It is an amenable number.

665126254669 is a deficient number, since it is larger than the sum of its proper divisors (1).

665126254669 is an equidigital number, since it uses as much as digits as its factorization.

665126254669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27993600, while the sum is 58.

The spelling of 665126254669 in words is "six hundred sixty-five billion, one hundred twenty-six million, two hundred fifty-four thousand, six hundred sixty-nine".