18871394136 has 64 divisors (see below), whose sum is σ = 57089940480. Its totient is φ = 5074659840.

The previous prime is 18871394099. The next prime is 18871394183. The reversal of 18871394136 is 63149317881.

It is a happy number.

It is a super-2 number, since 2×18871394136² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3300960 + ... + 3306671.

It is an arithmetic number, because the mean of its divisors is an integer number (892030320).

Almost surely, 2^18871394136 is an apocalyptic number.

It is an amenable number.

18871394136 is an abundant number, since it is smaller than the sum of its proper divisors (38218546344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18871394136 is a wasteful number, since it uses less digits than its factorization.

18871394136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6607664 (or 6607660 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The spelling of 18871394136 in words is "eighteen billion, eight hundred seventy-one million, three hundred ninety-four thousand, one hundred thirty-six".