18938008897 has 4 divisors (see below), whose sum is σ = 18940076800. Its totient is φ = 18935940996.

The previous prime is 18938008811. The next prime is 18938008907. The reversal of 18938008897 is 79880083981.

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 18938008897 - 2¹⁹ = 18937484609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18938003897) 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, 1020153 + ... + 1038550.

It is an arithmetic number, because the mean of its divisors is an integer number (4735019200).

Almost surely, 2^18938008897 is an apocalyptic number.

It is an amenable number.

18938008897 is a deficient number, since it is larger than the sum of its proper divisors (2067903).

18938008897 is an equidigital number, since it uses as much as digits as its factorization.

18938008897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067902.

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 18938008897 in words is "eighteen billion, nine hundred thirty-eight million, eight thousand, eight hundred ninety-seven".