18879683749 has 2 divisors, whose sum is σ = 18879683750. Its totient is φ = 18879683748.

The previous prime is 18879683741. The next prime is 18879683777. The reversal of 18879683749 is 94738697881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18784621249 + 95062500 = 137057^2 + 9750^2 .

It is a cyclic number.

It is not a de Polignac number, because 18879683749 - 2³ = 18879683741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18879683741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439841874 + 9439841875.

It is an arithmetic number, because the mean of its divisors is an integer number (9439841875).

Almost surely, 2^18879683749 is an apocalyptic number.

It is an amenable number.

18879683749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18879683749 is an equidigital number, since it uses as much as digits as its factorization.

18879683749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146313216, while the sum is 70.

The spelling of 18879683749 in words is "eighteen billion, eight hundred seventy-nine million, six hundred eighty-three thousand, seven hundred forty-nine".