99564126209 has 2 divisors, whose sum is σ = 99564126210. Its totient is φ = 99564126208.

The previous prime is 99564126143. The next prime is 99564126281. The reversal of 99564126209 is 90262146599.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68031245584 + 31532880625 = 260828^2 + 177575^2 .

It is an emirp because it is prime and its reverse (90262146599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99564126209 - 2⁸ = 99564125953 is a prime.

It is not a weakly prime, because it can be changed into another prime (99564126289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49782063104 + 49782063105.

It is an arithmetic number, because the mean of its divisors is an integer number (49782063105).

Almost surely, 2^99564126209 is an apocalyptic number.

It is an amenable number.

99564126209 is a deficient number, since it is larger than the sum of its proper divisors (1).

99564126209 is an equidigital number, since it uses as much as digits as its factorization.

99564126209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 99564126209 in words is "ninety-nine billion, five hundred sixty-four million, one hundred twenty-six thousand, two hundred nine".