666140874035123 has 2 divisors, whose sum is σ = 666140874035124. Its totient is φ = 666140874035122.

The previous prime is 666140874035113. The next prime is 666140874035137. The reversal of 666140874035123 is 321530478041666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666140874035123 - 2⁴ = 666140874035107 is a prime.

It is not a weakly prime, because it can be changed into another prime (666140874035113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070437017561 + 333070437017562.

It is an arithmetic number, because the mean of its divisors is an integer number (333070437017562).

Almost surely, 2^{666140874035123} is an apocalyptic number.

666140874035123 is a deficient number, since it is larger than the sum of its proper divisors (1).

666140874035123 is an equidigital number, since it uses as much as digits as its factorization.

666140874035123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 666140874035123 in words is "six hundred sixty-six trillion, one hundred forty billion, eight hundred seventy-four million, thirty-five thousand, one hundred twenty-three".