18738242749 has 2 divisors, whose sum is σ = 18738242750. Its totient is φ = 18738242748.

The previous prime is 18738242723. The next prime is 18738242759. The reversal of 18738242749 is 94724283781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12733542649 + 6004700100 = 112843^2 + 77490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18738242749 is a prime.

It is a super-2 number, since 2×18738242749² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18738242749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18738242759) 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, 9369121374 + 9369121375.

It is an arithmetic number, because the mean of its divisors is an integer number (9369121375).

Almost surely, 2^18738242749 is an apocalyptic number.

It is an amenable number.

18738242749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18738242749 is an equidigital number, since it uses as much as digits as its factorization.

18738242749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 55.

The spelling of 18738242749 in words is "eighteen billion, seven hundred thirty-eight million, two hundred forty-two thousand, seven hundred forty-nine".