18236284919 has 16 divisors (see below), whose sum is σ = 19979205120. Its totient is φ = 16590493920.

The previous prime is 18236284879. The next prime is 18236284981. The reversal of 18236284919 is 91948263281.

It is a cyclic number.

It is not a de Polignac number, because 18236284919 - 2⁸ = 18236284663 is a prime.

It is a super-2 number, since 2×18236284919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236284019) 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, 159347 + ... + 248724.

It is an arithmetic number, because the mean of its divisors is an integer number (1248700320).

Almost surely, 2^18236284919 is an apocalyptic number.

18236284919 is a deficient number, since it is larger than the sum of its proper divisors (1742920201).

18236284919 is a wasteful number, since it uses less digits than its factorization.

18236284919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408190.

The product of its digits is 1492992, while the sum is 53.

The spelling of 18236284919 in words is "eighteen billion, two hundred thirty-six million, two hundred eighty-four thousand, nine hundred nineteen".