12200975561 has 2 divisors, whose sum is σ = 12200975562. Its totient is φ = 12200975560.

The previous prime is 12200975491. The next prime is 12200975581. The reversal of 12200975561 is 16557900221.

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., 9150070336 + 3050905225 = 95656^2 + 55235^2 .

It is a cyclic number.

It is not a de Polignac number, because 12200975561 - 2¹⁰ = 12200974537 is a prime.

It is not a weakly prime, because it can be changed into another prime (12200975581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100487780 + 6100487781.

It is an arithmetic number, because the mean of its divisors is an integer number (6100487781).

Almost surely, 2^12200975561 is an apocalyptic number.

It is an amenable number.

12200975561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12200975561 is an equidigital number, since it uses as much as digits as its factorization.

12200975561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 12200975561 in words is "twelve billion, two hundred million, nine hundred seventy-five thousand, five hundred sixty-one".