1266912420497 has 2 divisors, whose sum is σ = 1266912420498. Its totient is φ = 1266912420496.

The previous prime is 1266912420457. The next prime is 1266912420503. The reversal of 1266912420497 is 7940242196621.

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., 866911828561 + 400000591936 = 931081^2 + 632456^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266912420497 - 2²² = 1266908226193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266912420427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633456210248 + 633456210249.

It is an arithmetic number, because the mean of its divisors is an integer number (633456210249).

Almost surely, 2^{1266912420497} is an apocalyptic number.

It is an amenable number.

1266912420497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266912420497 is an equidigital number, since it uses as much as digits as its factorization.

1266912420497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 1266912420497 in words is "one trillion, two hundred sixty-six billion, nine hundred twelve million, four hundred twenty thousand, four hundred ninety-seven".