18621739099 has 2 divisors, whose sum is σ = 18621739100. Its totient is φ = 18621739098.

The previous prime is 18621739079. The next prime is 18621739151. The reversal of 18621739099 is 99093712681.

It is a weak prime.

It is an emirp because it is prime and its reverse (99093712681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18621739099 - 2⁹ = 18621738587 is a prime.

It is a super-3 number, since 3×18621739099³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18621739039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310869549 + 9310869550.

It is an arithmetic number, because the mean of its divisors is an integer number (9310869550).

Almost surely, 2^18621739099 is an apocalyptic number.

18621739099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18621739099 is an equidigital number, since it uses as much as digits as its factorization.

18621739099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 18621739099 in words is "eighteen billion, six hundred twenty-one million, seven hundred thirty-nine thousand, ninety-nine".