18409777913 has 2 divisors, whose sum is σ = 18409777914. Its totient is φ = 18409777912.

The previous prime is 18409777907. The next prime is 18409777927. The reversal of 18409777913 is 31977790481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15777369664 + 2632408249 = 125608^2 + 51307^2 .

It is a cyclic number.

It is not a de Polignac number, because 18409777913 - 2²⁶ = 18342669049 is a prime.

It is not a weakly prime, because it can be changed into another prime (18409777933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9204888956 + 9204888957.

It is an arithmetic number, because the mean of its divisors is an integer number (9204888957).

Almost surely, 2^18409777913 is an apocalyptic number.

It is an amenable number.

18409777913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409777913 is an equidigital number, since it uses as much as digits as its factorization.

18409777913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The spelling of 18409777913 in words is "eighteen billion, four hundred nine million, seven hundred seventy-seven thousand, nine hundred thirteen".