18261186511 has 2 divisors, whose sum is σ = 18261186512. Its totient is φ = 18261186510.

The previous prime is 18261186509. The next prime is 18261186521. The reversal of 18261186511 is 11568116281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18261186511 - 2¹ = 18261186509 is a prime.

Together with 18261186509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18261186521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9130593255 + 9130593256.

It is an arithmetic number, because the mean of its divisors is an integer number (9130593256).

Almost surely, 2^18261186511 is an apocalyptic number.

18261186511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18261186511 is an equidigital number, since it uses as much as digits as its factorization.

18261186511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 40.

The spelling of 18261186511 in words is "eighteen billion, two hundred sixty-one million, one hundred eighty-six thousand, five hundred eleven".