18216113129 has 4 divisors (see below), whose sum is σ = 18316754820. Its totient is φ = 18115471440.

The previous prime is 18216113107. The next prime is 18216113141. The reversal of 18216113129 is 92131161281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2877786025 + 15338327104 = 53645^2 + 123848^2 .

It is a cyclic number.

It is not a de Polignac number, because 18216113129 - 2¹² = 18216109033 is a prime.

It is a super-3 number, since 3×18216113129³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18216013129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50320574 + ... + 50320935.

It is an arithmetic number, because the mean of its divisors is an integer number (4579188705).

Almost surely, 2^18216113129 is an apocalyptic number.

It is an amenable number.

18216113129 is a deficient number, since it is larger than the sum of its proper divisors (100641691).

18216113129 is a wasteful number, since it uses less digits than its factorization.

18216113129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100641690.

The product of its digits is 5184, while the sum is 35.

The spelling of 18216113129 in words is "eighteen billion, two hundred sixteen million, one hundred thirteen thousand, one hundred twenty-nine".