18240386573 has 2 divisors, whose sum is σ = 18240386574. Its totient is φ = 18240386572.

The previous prime is 18240386543. The next prime is 18240386597. The reversal of 18240386573 is 37568304281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10785445609 + 7454940964 = 103853^2 + 86342^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240386573 - 2¹² = 18240382477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240386543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120193286 + 9120193287.

It is an arithmetic number, because the mean of its divisors is an integer number (9120193287).

Almost surely, 2^18240386573 is an apocalyptic number.

It is an amenable number.

18240386573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240386573 is an equidigital number, since it uses as much as digits as its factorization.

18240386573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 18240386573 in words is "eighteen billion, two hundred forty million, three hundred eighty-six thousand, five hundred seventy-three".