18645952909 has 2 divisors, whose sum is σ = 18645952910. Its totient is φ = 18645952908.

The previous prime is 18645952891. The next prime is 18645952957. The reversal of 18645952909 is 90925954681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16050356100 + 2595596809 = 126690^2 + 50947^2 .

It is a cyclic number.

It is not a de Polignac number, because 18645952909 - 2¹⁵ = 18645920141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18645952999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9322976454 + 9322976455.

It is an arithmetic number, because the mean of its divisors is an integer number (9322976455).

Almost surely, 2^18645952909 is an apocalyptic number.

It is an amenable number.

18645952909 is a deficient number, since it is larger than the sum of its proper divisors (1).

18645952909 is an equidigital number, since it uses as much as digits as its factorization.

18645952909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 58.

The spelling of 18645952909 in words is "eighteen billion, six hundred forty-five million, nine hundred fifty-two thousand, nine hundred nine".