18566811478427 has 2 divisors, whose sum is σ = 18566811478428. Its totient is φ = 18566811478426.

The previous prime is 18566811478351. The next prime is 18566811478463. The reversal of 18566811478427 is 72487411866581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18566811478427 - 2³² = 18562516511131 is a prime.

It is not a weakly prime, because it can be changed into another prime (18566811478487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9283405739213 + 9283405739214.

It is an arithmetic number, because the mean of its divisors is an integer number (9283405739214).

Almost surely, 2^{18566811478427} is an apocalyptic number.

18566811478427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18566811478427 is an equidigital number, since it uses as much as digits as its factorization.

18566811478427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144506880, while the sum is 68.

The spelling of 18566811478427 in words is "eighteen trillion, five hundred sixty-six billion, eight hundred eleven million, four hundred seventy-eight thousand, four hundred twenty-seven".