18531104573 has 2 divisors, whose sum is σ = 18531104574. Its totient is φ = 18531104572.

The previous prime is 18531104549. The next prime is 18531104659. The reversal of 18531104573 is 37540113581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17197175044 + 1333929529 = 131138^2 + 36523^2 .

It is a cyclic number.

It is not a de Polignac number, because 18531104573 - 2¹² = 18531100477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18531104513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265552286 + 9265552287.

It is an arithmetic number, because the mean of its divisors is an integer number (9265552287).

Almost surely, 2^18531104573 is an apocalyptic number.

It is an amenable number.

18531104573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18531104573 is an equidigital number, since it uses as much as digits as its factorization.

18531104573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 18531104573 in words is "eighteen billion, five hundred thirty-one million, one hundred four thousand, five hundred seventy-three".