18538909511 has 2 divisors, whose sum is σ = 18538909512. Its totient is φ = 18538909510.

The previous prime is 18538909409. The next prime is 18538909517. The reversal of 18538909511 is 11590983581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18538909511 - 2¹⁸ = 18538647367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18538909511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18538909517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269454755 + 9269454756.

It is an arithmetic number, because the mean of its divisors is an integer number (9269454756).

Almost surely, 2^18538909511 is an apocalyptic number.

18538909511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18538909511 is an equidigital number, since it uses as much as digits as its factorization.

18538909511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 50.

The spelling of 18538909511 in words is "eighteen billion, five hundred thirty-eight million, nine hundred nine thousand, five hundred eleven".