18409938611 has 2 divisors, whose sum is σ = 18409938612. Its totient is φ = 18409938610.

The previous prime is 18409938593. The next prime is 18409938629. The reversal of 18409938611 is 11683990481.

It is a balanced prime because it is at equal distance from previous prime (18409938593) and next prime (18409938629).

It is a cyclic number.

It is not a de Polignac number, because 18409938611 - 2³⁴ = 1230069427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18409938611.

It is not a weakly prime, because it can be changed into another prime (18409938011) 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, 9204969305 + 9204969306.

It is an arithmetic number, because the mean of its divisors is an integer number (9204969306).

Almost surely, 2^18409938611 is an apocalyptic number.

18409938611 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409938611 is an equidigital number, since it uses as much as digits as its factorization.

18409938611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 18409938611 in words is "eighteen billion, four hundred nine million, nine hundred thirty-eight thousand, six hundred eleven".