665126560279 has 2 divisors, whose sum is σ = 665126560280. Its totient is φ = 665126560278.

The previous prime is 665126560253. The next prime is 665126560327. The reversal of 665126560279 is 972065621566.

665126560279 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665126560279 - 2¹⁵ = 665126527511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665126560249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332563280139 + 332563280140.

It is an arithmetic number, because the mean of its divisors is an integer number (332563280140).

Almost surely, 2^665126560279 is an apocalyptic number.

665126560279 is a deficient number, since it is larger than the sum of its proper divisors (1).

665126560279 is an equidigital number, since it uses as much as digits as its factorization.

665126560279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 665126560279 in words is "six hundred sixty-five billion, one hundred twenty-six million, five hundred sixty thousand, two hundred seventy-nine".