18891514889 has 16 divisors (see below), whose sum is σ = 20423667264. Its totient is φ = 17370763200.

The previous prime is 18891514867. The next prime is 18891514891. The reversal of 18891514889 is 98841519881.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18891514889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18891514849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5288474 + ... + 5292044.

It is an arithmetic number, because the mean of its divisors is an integer number (1276479204).

Almost surely, 2^18891514889 is an apocalyptic number.

It is an amenable number.

18891514889 is a deficient number, since it is larger than the sum of its proper divisors (1532152375).

18891514889 is a wasteful number, since it uses less digits than its factorization.

18891514889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048.

The product of its digits is 6635520, while the sum is 62.

The spelling of 18891514889 in words is "eighteen billion, eight hundred ninety-one million, five hundred fourteen thousand, eight hundred eighty-nine".