1266730376621 has 2 divisors, whose sum is σ = 1266730376622. Its totient is φ = 1266730376620.

The previous prime is 1266730376609. The next prime is 1266730376623.

1266730376621 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221013950025 + 45716426596 = 1104995^2 + 213814^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1266730376621 - 2²⁶ = 1266663267757 is a prime.

Together with 1266730376623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1266730376621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266730376623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633365188310 + 633365188311.

It is an arithmetic number, because the mean of its divisors is an integer number (633365188311).

Almost surely, 2^{1266730376621} is an apocalyptic number.

It is an amenable number.

1266730376621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266730376621 is an equidigital number, since it uses as much as digits as its factorization.

1266730376621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 50.

The spelling of 1266730376621 in words is "one trillion, two hundred sixty-six billion, seven hundred thirty million, three hundred seventy-six thousand, six hundred twenty-one".