18537038889 has 4 divisors (see below), whose sum is σ = 24716051856. Its totient is φ = 12358025924.

The previous prime is 18537038879. The next prime is 18537038929. The reversal of 18537038889 is 98883073581.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98883073581 = 3 ⋅32961024527.

It is a cyclic number.

It is not a de Polignac number, because 18537038889 - 2⁵ = 18537038857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18537038879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3089506479 + ... + 3089506484.

It is an arithmetic number, because the mean of its divisors is an integer number (6179012964).

Almost surely, 2^18537038889 is an apocalyptic number.

It is an amenable number.

18537038889 is a deficient number, since it is larger than the sum of its proper divisors (6179012967).

18537038889 is an equidigital number, since it uses as much as digits as its factorization.

18537038889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179012966.

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 18537038889 in words is "eighteen billion, five hundred thirty-seven million, thirty-eight thousand, eight hundred eighty-nine".