18186601091 has 2 divisors, whose sum is σ = 18186601092. Its totient is φ = 18186601090.

The previous prime is 18186601067. The next prime is 18186601099. The reversal of 18186601091 is 19010668181.

It is a strong prime.

It is an emirp because it is prime and its reverse (19010668181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18186601091 is a prime.

It is not a weakly prime, because it can be changed into another prime (18186601099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093300545 + 9093300546.

It is an arithmetic number, because the mean of its divisors is an integer number (9093300546).

Almost surely, 2^18186601091 is an apocalyptic number.

18186601091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18186601091 is an equidigital number, since it uses as much as digits as its factorization.

18186601091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 18186601091 in words is "eighteen billion, one hundred eighty-six million, six hundred one thousand, ninety-one".