12905743785761 has 4 divisors (see below), whose sum is σ = 12906539323392. Its totient is φ = 12904948248132.

The previous prime is 12905743785751. The next prime is 12905743785763. The reversal of 12905743785761 is 16758734750921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12905743785761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12905743785763) 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 in 3 ways as a sum of consecutive naturals, for example, 397744481 + ... + 397776926.

It is an arithmetic number, because the mean of its divisors is an integer number (3226634830848).

It is a 1-persistent number, because it is pandigital, but 2⋅12905743785761 = 25811487571522 is not.

Almost surely, 2^{12905743785761} is an apocalyptic number.

It is an amenable number.

12905743785761 is a deficient number, since it is larger than the sum of its proper divisors (795537631).

12905743785761 is an equidigital number, since it uses as much as digits as its factorization.

12905743785761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795537630.

The product of its (nonzero) digits is 88905600, while the sum is 65.

The spelling of 12905743785761 in words is "twelve trillion, nine hundred five billion, seven hundred forty-three million, seven hundred eighty-five thousand, seven hundred sixty-one".