2666420424257 has 2 divisors, whose sum is σ = 2666420424258. Its totient is φ = 2666420424256.

The previous prime is 2666420424221. The next prime is 2666420424277. The reversal of 2666420424257 is 7524240246662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1675740606016 + 990679818241 = 1294504^2 + 995329^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666420424257 - 2²⁰ = 2666419375681 is a prime.

It is not a weakly prime, because it can be changed into another prime (2666420424277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333210212128 + 1333210212129.

It is an arithmetic number, because the mean of its divisors is an integer number (1333210212129).

Almost surely, 2^{2666420424257} is an apocalyptic number.

It is an amenable number.

2666420424257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666420424257 is an equidigital number, since it uses as much as digits as its factorization.

2666420424257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 50.

The spelling of 2666420424257 in words is "two trillion, six hundred sixty-six billion, four hundred twenty million, four hundred twenty-four thousand, two hundred fifty-seven".