18380288066989 has 4 divisors (see below), whose sum is σ = 18380354580000. Its totient is φ = 18380221553980.

The previous prime is 18380288066953. The next prime is 18380288067013. The reversal of 18380288066989 is 98966088208381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18380288066989 - 2⁹ = 18380288066477 is a prime.

It is a super-2 number, since 2×18380288066989² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18380288066689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32840257 + ... + 33395254.

It is an arithmetic number, because the mean of its divisors is an integer number (4595088645000).

Almost surely, 2^{18380288066989} is an apocalyptic number.

It is an amenable number.

18380288066989 is a deficient number, since it is larger than the sum of its proper divisors (66513011).

18380288066989 is an equidigital number, since it uses as much as digits as its factorization.

18380288066989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66513010.

The product of its (nonzero) digits is 573308928, while the sum is 76.

The spelling of 18380288066989 in words is "eighteen trillion, three hundred eighty billion, two hundred eighty-eight million, sixty-six thousand, nine hundred eighty-nine".