18744615289 has 2 divisors, whose sum is σ = 18744615290. Its totient is φ = 18744615288.

The previous prime is 18744615257. The next prime is 18744615301. The reversal of 18744615289 is 98251644781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17991661689 + 752953600 = 134133^2 + 27440^2 .

It is a cyclic number.

It is not a de Polignac number, because 18744615289 - 2⁵ = 18744615257 is a prime.

It is a super-2 number, since 2×18744615289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18744610289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372307644 + 9372307645.

It is an arithmetic number, because the mean of its divisors is an integer number (9372307645).

Almost surely, 2^18744615289 is an apocalyptic number.

It is an amenable number.

18744615289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744615289 is an equidigital number, since it uses as much as digits as its factorization.

18744615289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 55.

The spelling of 18744615289 in words is "eighteen billion, seven hundred forty-four million, six hundred fifteen thousand, two hundred eighty-nine".