18987755837 has 4 divisors (see below), whose sum is σ = 19008418080. Its totient is φ = 18967093596.

The previous prime is 18987755833. The next prime is 18987755861. The reversal of 18987755837 is 73855778981.

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: 73855778981 = 149 ⋅495676369.

It is a cyclic number.

It is not a de Polignac number, because 18987755837 - 2² = 18987755833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987755833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10329743 + ... + 10331580.

It is an arithmetic number, because the mean of its divisors is an integer number (4752104520).

Almost surely, 2^18987755837 is an apocalyptic number.

It is an amenable number.

18987755837 is a deficient number, since it is larger than the sum of its proper divisors (20662243).

18987755837 is an equidigital number, since it uses as much as digits as its factorization.

18987755837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20662242.

The product of its digits is 118540800, while the sum is 68.

The spelling of 18987755837 in words is "eighteen billion, nine hundred eighty-seven million, seven hundred fifty-five thousand, eight hundred thirty-seven".