18231648471 has 24 divisors (see below), whose sum is σ = 26639265744. Its totient is φ = 12014217600.

The previous prime is 18231648427. The next prime is 18231648481. The reversal of 18231648471 is 17484613281.

18231648471 is a `hidden beast` number, since 18 + 2 + 3 + 164 + 8 + 471 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-18231648471 is a prime.

It is a super-3 number, since 3×18231648471³ (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 (18231648481) 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, 544600 + ... + 577106.

It is an arithmetic number, because the mean of its divisors is an integer number (1109969406).

Almost surely, 2^18231648471 is an apocalyptic number.

18231648471 is a deficient number, since it is larger than the sum of its proper divisors (8407617273).

18231648471 is a wasteful number, since it uses less digits than its factorization.

18231648471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33231 (or 33228 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The spelling of 18231648471 in words is "eighteen billion, two hundred thirty-one million, six hundred forty-eight thousand, four hundred seventy-one".