2666905288121 has 2 divisors, whose sum is σ = 2666905288122. Its totient is φ = 2666905288120.

The previous prime is 2666905288087. The next prime is 2666905288127. The reversal of 2666905288121 is 1218825096662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1681275289600 + 985629998521 = 1296640^2 + 992789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2666905288121 is a prime.

It is a super-2 number, since 2×2666905288121² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2666905288127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333452644060 + 1333452644061.

It is an arithmetic number, because the mean of its divisors is an integer number (1333452644061).

Almost surely, 2^{2666905288121} is an apocalyptic number.

It is an amenable number.

2666905288121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666905288121 is an equidigital number, since it uses as much as digits as its factorization.

2666905288121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 2666905288121 in words is "two trillion, six hundred sixty-six billion, nine hundred five million, two hundred eighty-eight thousand, one hundred twenty-one".