12206561537 has 2 divisors, whose sum is σ = 12206561538. Its totient is φ = 12206561536.

The previous prime is 12206561531. The next prime is 12206561539. The reversal of 12206561537 is 73516560221.

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., 6379376641 + 5827184896 = 79871^2 + 76336^2 .

It is a cyclic number.

It is not a de Polignac number, because 12206561537 - 2¹⁸ = 12206299393 is a prime.

Together with 12206561539, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12206561537.

It is not a weakly prime, because it can be changed into another prime (12206561531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6103280768 + 6103280769.

It is an arithmetic number, because the mean of its divisors is an integer number (6103280769).

Almost surely, 2^12206561537 is an apocalyptic number.

It is an amenable number.

12206561537 is a deficient number, since it is larger than the sum of its proper divisors (1).

12206561537 is an equidigital number, since it uses as much as digits as its factorization.

12206561537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 12206561537 in words is "twelve billion, two hundred six million, five hundred sixty-one thousand, five hundred thirty-seven".