18213399861 has 8 divisors (see below), whose sum is σ = 24331146624. Its totient is φ = 12118959840.

The previous prime is 18213399847. The next prime is 18213399913. The reversal of 18213399861 is 16899331281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18213399861 - 2⁶ = 18213399797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213399811) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5824861 + ... + 5827986.

It is an arithmetic number, because the mean of its divisors is an integer number (3041393328).

Almost surely, 2^18213399861 is an apocalyptic number.

It is an amenable number.

18213399861 is a deficient number, since it is larger than the sum of its proper divisors (6117746763).

18213399861 is a wasteful number, since it uses less digits than its factorization.

18213399861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11653371.

The product of its digits is 559872, while the sum is 51.

The spelling of 18213399861 in words is "eighteen billion, two hundred thirteen million, three hundred ninety-nine thousand, eight hundred sixty-one".