18989378065 has 8 divisors (see below), whose sum is σ = 26042575680. Its totient is φ = 13021287792.

The previous prime is 18989378053. The next prime is 18989378081. The reversal of 18989378065 is 56087398981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18989378065 - 2⁵ = 18989378033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18989377988 and 18989378006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271276795 + ... + 271276864.

It is an arithmetic number, because the mean of its divisors is an integer number (3255321960).

Almost surely, 2^18989378065 is an apocalyptic number.

It is an amenable number.

18989378065 is a deficient number, since it is larger than the sum of its proper divisors (7053197615).

18989378065 is an equidigital number, since it uses as much as digits as its factorization.

18989378065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542553671.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 18989378065 in words is "eighteen billion, nine hundred eighty-nine million, three hundred seventy-eight thousand, sixty-five".