12261779953 has 2 divisors, whose sum is σ = 12261779954. Its totient is φ = 12261779952.

The previous prime is 12261779899. The next prime is 12261779977. The reversal of 12261779953 is 35997716221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9349342864 + 2912437089 = 96692^2 + 53967^2 .

It is a cyclic number.

It is not a de Polignac number, because 12261779953 - 2¹⁷ = 12261648881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12261779953.

It is not a weakly prime, because it can be changed into another prime (12261779653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6130889976 + 6130889977.

It is an arithmetic number, because the mean of its divisors is an integer number (6130889977).

Almost surely, 2^12261779953 is an apocalyptic number.

It is an amenable number.

12261779953 is a deficient number, since it is larger than the sum of its proper divisors (1).

12261779953 is an equidigital number, since it uses as much as digits as its factorization.

12261779953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 52.

The spelling of 12261779953 in words is "twelve billion, two hundred sixty-one million, seven hundred seventy-nine thousand, nine hundred fifty-three".