18471427494499 has 16 divisors (see below), whose sum is σ = 21541624619200. Its totient is φ = 15832210181760.

The previous prime is 18471427494473. The next prime is 18471427494521. The reversal of 18471427494499 is 99449472417481.

It is not a de Polignac number, because 18471427494499 - 2⁵ = 18471427494467 is a prime.

It is a super-2 number, since 2×18471427494499² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18471427494419) 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, 11862037 + ... + 13328569.

It is an arithmetic number, because the mean of its divisors is an integer number (1346351538700).

Almost surely, 2^{18471427494499} is an apocalyptic number.

18471427494499 is a deficient number, since it is larger than the sum of its proper divisors (3070197124701).

18471427494499 is an equidigital number, since it uses as much as digits as its factorization.

18471427494499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503275 (or 1503261 counting only the distinct ones).

The product of its digits is 585252864, while the sum is 73.

The spelling of 18471427494499 in words is "eighteen trillion, four hundred seventy-one billion, four hundred twenty-seven million, four hundred ninety-four thousand, four hundred ninety-nine".