561664234121099 has 2 divisors, whose sum is σ = 561664234121100. Its totient is φ = 561664234121098.

The previous prime is 561664234121093. The next prime is 561664234121149. The reversal of 561664234121099 is 990121432466165.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561664234121099 is a prime.

It is not a weakly prime, because it can be changed into another prime (561664234121093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280832117060549 + 280832117060550.

It is an arithmetic number, because the mean of its divisors is an integer number (280832117060550).

Almost surely, 2^{561664234121099} is an apocalyptic number.

561664234121099 is a deficient number, since it is larger than the sum of its proper divisors (1).

561664234121099 is an equidigital number, since it uses as much as digits as its factorization.

561664234121099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16796160, while the sum is 59.

The spelling of 561664234121099 in words is "five hundred sixty-one trillion, six hundred sixty-four billion, two hundred thirty-four million, one hundred twenty-one thousand, ninety-nine".