2666431357939 has 2 divisors, whose sum is σ = 2666431357940. Its totient is φ = 2666431357938.

The previous prime is 2666431357927. The next prime is 2666431357943. The reversal of 2666431357939 is 9397531346662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2666431357939 - 2⁵ = 2666431357907 is a prime.

It is not a weakly prime, because it can be changed into another prime (2666431357339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333215678969 + 1333215678970.

It is an arithmetic number, because the mean of its divisors is an integer number (1333215678970).

Almost surely, 2^{2666431357939} is an apocalyptic number.

2666431357939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666431357939 is an equidigital number, since it uses as much as digits as its factorization.

2666431357939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132269760, while the sum is 64.

The spelling of 2666431357939 in words is "two trillion, six hundred sixty-six billion, four hundred thirty-one million, three hundred fifty-seven thousand, nine hundred thirty-nine".