18383729281 has 16 divisors (see below), whose sum is σ = 19844879040. Its totient is φ = 16972865280.

The previous prime is 18383729279. The next prime is 18383729291. The reversal of 18383729281 is 18292738381.

It is a cyclic number.

It is not a de Polignac number, because 18383729281 - 2¹ = 18383729279 is a prime.

It is a super-2 number, since 2×18383729281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18383729291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730006 + ... + 754768.

It is an arithmetic number, because the mean of its divisors is an integer number (1240304940).

Almost surely, 2^18383729281 is an apocalyptic number.

It is an amenable number.

18383729281 is a deficient number, since it is larger than the sum of its proper divisors (1461149759).

18383729281 is a wasteful number, since it uses less digits than its factorization.

18383729281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25776.

The product of its digits is 1161216, while the sum is 52.

The spelling of 18383729281 in words is "eighteen billion, three hundred eighty-three million, seven hundred twenty-nine thousand, two hundred eighty-one".