18187059211 has 2 divisors, whose sum is σ = 18187059212. Its totient is φ = 18187059210.

The previous prime is 18187059197. The next prime is 18187059223. The reversal of 18187059211 is 11295078181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18187059211 - 2¹⁷ = 18186928139 is a prime.

It is not a weakly prime, because it can be changed into another prime (18187059811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093529605 + 9093529606.

It is an arithmetic number, because the mean of its divisors is an integer number (9093529606).

Almost surely, 2^18187059211 is an apocalyptic number.

18187059211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18187059211 is an equidigital number, since it uses as much as digits as its factorization.

18187059211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 43.

It can be divided in two parts, 181870 and 59211, that added together give a square (241081 = 491²).

The spelling of 18187059211 in words is "eighteen billion, one hundred eighty-seven million, fifty-nine thousand, two hundred eleven".