12105899777 has 2 divisors, whose sum is σ = 12105899778. Its totient is φ = 12105899776.

The previous prime is 12105899749. The next prime is 12105899783. The reversal of 12105899777 is 77799850121.

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., 10579356736 + 1526543041 = 102856^2 + 39071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12105899777 is a prime.

It is not a weakly prime, because it can be changed into another prime (12105899677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6052949888 + 6052949889.

It is an arithmetic number, because the mean of its divisors is an integer number (6052949889).

Almost surely, 2^12105899777 is an apocalyptic number.

It is an amenable number.

12105899777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12105899777 is an equidigital number, since it uses as much as digits as its factorization.

12105899777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 56.

The spelling of 12105899777 in words is "twelve billion, one hundred five million, eight hundred ninety-nine thousand, seven hundred seventy-seven".