12905743785691 has 2 divisors, whose sum is σ = 12905743785692. Its totient is φ = 12905743785690.

The previous prime is 12905743785643. The next prime is 12905743785721. The reversal of 12905743785691 is 19658734750921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12905743785691 - 2²⁵ = 12905710231259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12905743785611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6452871892845 + 6452871892846.

It is an arithmetic number, because the mean of its divisors is an integer number (6452871892846).

It is a 1-persistent number, because it is pandigital, but 2⋅12905743785691 = 25811487571382 is not.

Almost surely, 2^{12905743785691} is an apocalyptic number.

12905743785691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12905743785691 is an equidigital number, since it uses as much as digits as its factorization.

12905743785691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114307200, while the sum is 67.

The spelling of 12905743785691 in words is "twelve trillion, nine hundred five billion, seven hundred forty-three million, seven hundred eighty-five thousand, six hundred ninety-one".