18516841727 has 2 divisors, whose sum is σ = 18516841728. Its totient is φ = 18516841726.

The previous prime is 18516841667. The next prime is 18516841751. The reversal of 18516841727 is 72714861581.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18516841727 - 2⁸ = 18516841471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18516841627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258420863 + 9258420864.

It is an arithmetic number, because the mean of its divisors is an integer number (9258420864).

Almost surely, 2^18516841727 is an apocalyptic number.

18516841727 is a deficient number, since it is larger than the sum of its proper divisors (1).

18516841727 is an equidigital number, since it uses as much as digits as its factorization.

18516841727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 50.

The spelling of 18516841727 in words is "eighteen billion, five hundred sixteen million, eight hundred forty-one thousand, seven hundred twenty-seven".