18087669689 has 2 divisors, whose sum is σ = 18087669690. Its totient is φ = 18087669688.

The previous prime is 18087669671. The next prime is 18087669697. The reversal of 18087669689 is 98696678081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17006246464 + 1081423225 = 130408^2 + 32885^2 .

It is a cyclic number.

It is not a de Polignac number, because 18087669689 - 2³² = 13792702393 is a prime.

It is not a weakly prime, because it can be changed into another prime (18087669289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043834844 + 9043834845.

It is an arithmetic number, because the mean of its divisors is an integer number (9043834845).

Almost surely, 2^18087669689 is an apocalyptic number.

It is an amenable number.

18087669689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18087669689 is an equidigital number, since it uses as much as digits as its factorization.

18087669689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62705664, while the sum is 68.

The spelling of 18087669689 in words is "eighteen billion, eighty-seven million, six hundred sixty-nine thousand, six hundred eighty-nine".