18749581116949 has 2 divisors, whose sum is σ = 18749581116950. Its totient is φ = 18749581116948.

The previous prime is 18749581116919. The next prime is 18749581117039. The reversal of 18749581116949 is 94961118594781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12264053028049 + 6485528088900 = 3502007^2 + 2546670^2 .

It is a cyclic number.

It is not a de Polignac number, because 18749581116949 - 2¹⁹ = 18749580592661 is a prime.

It is a super-2 number, since 2×18749581116949² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18749581116919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9374790558474 + 9374790558475.

It is an arithmetic number, because the mean of its divisors is an integer number (9374790558475).

Almost surely, 2^{18749581116949} is an apocalyptic number.

It is an amenable number.

18749581116949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18749581116949 is an equidigital number, since it uses as much as digits as its factorization.

18749581116949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 73.

The spelling of 18749581116949 in words is "eighteen trillion, seven hundred forty-nine billion, five hundred eighty-one million, one hundred sixteen thousand, nine hundred forty-nine".