18871118237 has 16 divisors (see below), whose sum is σ = 19340128512. Its totient is φ = 18408384000.

The previous prime is 18871118221. The next prime is 18871118239. The reversal of 18871118237 is 73281117881.

It is a cyclic number.

It is not a de Polignac number, because 18871118237 - 2⁴ = 18871118221 is a prime.

It is a super-2 number, since 2×18871118237² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18871118191 and 18871118200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871118239) 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, 5864453 + ... + 5867669.

It is an arithmetic number, because the mean of its divisors is an integer number (1208758032).

Almost surely, 2^18871118237 is an apocalyptic number.

It is an amenable number.

18871118237 is a deficient number, since it is larger than the sum of its proper divisors (469010275).

18871118237 is a wasteful number, since it uses less digits than its factorization.

18871118237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148.

The product of its digits is 150528, while the sum is 47.

The spelling of 18871118237 in words is "eighteen billion, eight hundred seventy-one million, one hundred eighteen thousand, two hundred thirty-seven".