18816473487 has 24 divisors (see below), whose sum is σ = 29190029232. Its totient is φ = 10750320000.

The previous prime is 18816473449. The next prime is 18816473491. The reversal of 18816473487 is 78437461881.

It is a de Polignac number, because none of the positive numbers 2^k-18816473487 is a prime.

It is a super-3 number, since 3×18816473487³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18816473437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1316037 + ... + 1330257.

It is an arithmetic number, because the mean of its divisors is an integer number (1216251218).

Almost surely, 2^18816473487 is an apocalyptic number.

18816473487 is a deficient number, since it is larger than the sum of its proper divisors (10373555745).

18816473487 is a wasteful number, since it uses less digits than its factorization.

18816473487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23239 (or 23232 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 57.

The spelling of 18816473487 in words is "eighteen billion, eight hundred sixteen million, four hundred seventy-three thousand, four hundred eighty-seven".