18249999997 has 2 divisors, whose sum is σ = 18249999998. Its totient is φ = 18249999996.

The previous prime is 18249999983. The next prime is 18250000007. The reversal of 18249999997 is 79999994281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16590985636 + 1659014361 = 128806^2 + 40731^2 .

It is an emirp because it is prime and its reverse (79999994281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18249999997 - 2¹⁹ = 18249475709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18249999907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9124999998 + 9124999999.

It is an arithmetic number, because the mean of its divisors is an integer number (9124999999).

Almost surely, 2^18249999997 is an apocalyptic number.

It is an amenable number.

18249999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18249999997 is an equidigital number, since it uses as much as digits as its factorization.

18249999997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238085568, while the sum is 76.

The spelling of 18249999997 in words is "eighteen billion, two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".