12770405561 has 2 divisors, whose sum is σ = 12770405562. Its totient is φ = 12770405560.

The previous prime is 12770405521. The next prime is 12770405563. The reversal of 12770405561 is 16550407721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10576888336 + 2193517225 = 102844^2 + 46835^2 .

It is a cyclic number.

It is not a de Polignac number, because 12770405561 - 2⁶ = 12770405497 is a prime.

Together with 12770405563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12770405563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385202780 + 6385202781.

It is an arithmetic number, because the mean of its divisors is an integer number (6385202781).

Almost surely, 2^12770405561 is an apocalyptic number.

It is an amenable number.

12770405561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12770405561 is an equidigital number, since it uses as much as digits as its factorization.

12770405561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 38.

The spelling of 12770405561 in words is "twelve billion, seven hundred seventy million, four hundred five thousand, five hundred sixty-one".