1266912420457 has 2 divisors, whose sum is σ = 1266912420458. Its totient is φ = 1266912420456.

The previous prime is 1266912420439. The next prime is 1266912420497. The reversal of 1266912420457 is 7540242196621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1064138728041 + 202773692416 = 1031571^2 + 450304^2 .

It is an emirp because it is prime and its reverse (7540242196621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266912420457 is a prime.

It is a super-2 number, since 2×1266912420457² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1266912420457.

It is not a weakly prime, because it can be changed into another prime (1266912420427) 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, 633456210228 + 633456210229.

It is an arithmetic number, because the mean of its divisors is an integer number (633456210229).

Almost surely, 2^{1266912420457} is an apocalyptic number.

It is an amenable number.

1266912420457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266912420457 is an equidigital number, since it uses as much as digits as its factorization.

1266912420457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 1266912420457 in words is "one trillion, two hundred sixty-six billion, nine hundred twelve million, four hundred twenty thousand, four hundred fifty-seven".