18271236672 has 84 divisors (see below), whose sum is σ = 56399777980. Its totient is φ = 5621916672.

The previous prime is 18271236653. The next prime is 18271236673. The reversal of 18271236672 is 27663217281.

18271236672 is a `hidden beast` number, since 18 + 271 + 2 + 366 + 7 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12486721536 + 5784515136 = 111744^2 + 76056^2 .

It is not an unprimeable number, because it can be changed into a prime (18271236673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1212547 + ... + 1227522.

Almost surely, 2^18271236672 is an apocalyptic number.

18271236672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18271236672 is an abundant number, since it is smaller than the sum of its proper divisors (38128541308).

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

18271236672 is a wasteful number, since it uses less digits than its factorization.

18271236672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440100 (or 2440087 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The spelling of 18271236672 in words is "eighteen billion, two hundred seventy-one million, two hundred thirty-six thousand, six hundred seventy-two".