18210694872 has 32 divisors (see below), whose sum is σ = 46206244800. Its totient is φ = 5979630624.

The previous prime is 18210694823. The next prime is 18210694877. The reversal of 18210694872 is 27849601281.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18210694877) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5660922 + ... + 5664137.

It is an arithmetic number, because the mean of its divisors is an integer number (1443945150).

Almost surely, 2^18210694872 is an apocalyptic number.

18210694872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18210694872 is an abundant number, since it is smaller than the sum of its proper divisors (27995549928).

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

18210694872 is a wasteful number, since it uses less digits than its factorization.

18210694872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11325135 (or 11325131 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 18210694872 in words is "eighteen billion, two hundred ten million, six hundred ninety-four thousand, eight hundred seventy-two".