18518519536973 has 2 divisors, whose sum is σ = 18518519536974. Its totient is φ = 18518519536972.

The previous prime is 18518519536921. The next prime is 18518519537047. The reversal of 18518519536973 is 37963591581581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17404223954569 + 1114295582404 = 4171837^2 + 1055602^2 .

It is a cyclic number.

It is not a de Polignac number, because 18518519536973 - 2²⁰ = 18518518488397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18518519536897 and 18518519536906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518519536873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259259768486 + 9259259768487.

It is an arithmetic number, because the mean of its divisors is an integer number (9259259768487).

Almost surely, 2^{18518519536973} is an apocalyptic number.

It is an amenable number.

18518519536973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518519536973 is an equidigital number, since it uses as much as digits as its factorization.

18518519536973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944000, while the sum is 71.

The spelling of 18518519536973 in words is "eighteen trillion, five hundred eighteen billion, five hundred nineteen million, five hundred thirty-six thousand, nine hundred seventy-three".