18213123050 has 12 divisors (see below), whose sum is σ = 33876408966. Its totient is φ = 7285249200.

The previous prime is 18213123041. The next prime is 18213123073. The reversal of 18213123050 is 5032131281.

It can be written as a sum of positive squares in 3 ways, for example, as 15549840601 + 2663282449 = 124699^2 + 51607^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182131181 + ... + 182131280.

Almost surely, 2^18213123050 is an apocalyptic number.

18213123050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18213123050 is a deficient number, since it is larger than the sum of its proper divisors (15663285916).

18213123050 is a wasteful number, since it uses less digits than its factorization.

18213123050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364262473 (or 364262468 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 18213123050 in words is "eighteen billion, two hundred thirteen million, one hundred twenty-three thousand, fifty".