18738242797 has 2 divisors, whose sum is σ = 18738242798. Its totient is φ = 18738242796.

The previous prime is 18738242759. The next prime is 18738242821. The reversal of 18738242797 is 79724283781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14694045961 + 4044196836 = 121219^2 + 63594^2 .

It is an emirp because it is prime and its reverse (79724283781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18738242797 is a prime.

It is a super-2 number, since 2×18738242797² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18738042797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369121398 + 9369121399.

It is an arithmetic number, because the mean of its divisors is an integer number (9369121399).

Almost surely, 2^18738242797 is an apocalyptic number.

It is an amenable number.

18738242797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18738242797 is an equidigital number, since it uses as much as digits as its factorization.

18738242797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 58.

The spelling of 18738242797 in words is "eighteen billion, seven hundred thirty-eight million, two hundred forty-two thousand, seven hundred ninety-seven".