12705809099 has 2 divisors, whose sum is σ = 12705809100. Its totient is φ = 12705809098.

The previous prime is 12705809069. The next prime is 12705809147. The reversal of 12705809099 is 99090850721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12705809099 - 2²⁸ = 12437373643 is a prime.

It is a super-2 number, since 2×12705809099² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12705809069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6352904549 + 6352904550.

It is an arithmetic number, because the mean of its divisors is an integer number (6352904550).

Almost surely, 2^12705809099 is an apocalyptic number.

12705809099 is a deficient number, since it is larger than the sum of its proper divisors (1).

12705809099 is an equidigital number, since it uses as much as digits as its factorization.

12705809099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 50.

The spelling of 12705809099 in words is "twelve billion, seven hundred five million, eight hundred nine thousand, ninety-nine".