18240386597 has 2 divisors, whose sum is σ = 18240386598. Its totient is φ = 18240386596.

The previous prime is 18240386573. The next prime is 18240386603. The reversal of 18240386597 is 79568304281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15702846721 + 2537539876 = 125311^2 + 50374^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240386597 - 2¹⁶ = 18240321061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240380597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120193298 + 9120193299.

It is an arithmetic number, because the mean of its divisors is an integer number (9120193299).

It is a 1-persistent number, because it is pandigital, but 2⋅18240386597 = 36480773194 is not.

Almost surely, 2^18240386597 is an apocalyptic number.

It is an amenable number.

18240386597 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240386597 is an equidigital number, since it uses as much as digits as its factorization.

18240386597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 18240386597 in words is "eighteen billion, two hundred forty million, three hundred eighty-six thousand, five hundred ninety-seven".