18409777927 has 2 divisors, whose sum is σ = 18409777928. Its totient is φ = 18409777926.

The previous prime is 18409777913. The next prime is 18409777931. The reversal of 18409777927 is 72977790481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18409777927 - 2²³ = 18401389319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18409777907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9204888963 + 9204888964.

It is an arithmetic number, because the mean of its divisors is an integer number (9204888964).

Almost surely, 2^18409777927 is an apocalyptic number.

18409777927 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409777927 is an equidigital number, since it uses as much as digits as its factorization.

18409777927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12446784, while the sum is 61.

The spelling of 18409777927 in words is "eighteen billion, four hundred nine million, seven hundred seventy-seven thousand, nine hundred twenty-seven".