18618371771 has 2 divisors, whose sum is σ = 18618371772. Its totient is φ = 18618371770.

The previous prime is 18618371713. The next prime is 18618371777. The reversal of 18618371771 is 17717381681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18618371771 - 2¹⁰ = 18618370747 is a prime.

It is not a weakly prime, because it can be changed into another prime (18618371777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9309185885 + 9309185886.

It is an arithmetic number, because the mean of its divisors is an integer number (9309185886).

Almost surely, 2^18618371771 is an apocalyptic number.

18618371771 is a deficient number, since it is larger than the sum of its proper divisors (1).

18618371771 is an equidigital number, since it uses as much as digits as its factorization.

18618371771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 50.

The spelling of 18618371771 in words is "eighteen billion, six hundred eighteen million, three hundred seventy-one thousand, seven hundred seventy-one".