18243534258 has 40 divisors (see below), whose sum is σ = 43283685852. Its totient is φ = 5723460864.

The previous prime is 18243534233. The next prime is 18243534271. The reversal of 18243534258 is 85243534281.

18243534258 is a `hidden beast` number, since 18 + 243 + 5 + 342 + 58 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18242013969 + 1520289 = 135063^2 + 1233^2 .

It is a super-2 number, since 2×18243534258² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3309435 + ... + 3314942.

Almost surely, 2^18243534258 is an apocalyptic number.

18243534258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18243534258 is an abundant number, since it is smaller than the sum of its proper divisors (25040151594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18243534258 is a wasteful number, since it uses less digits than its factorization.

18243534258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624408 (or 6624399 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The spelling of 18243534258 in words is "eighteen billion, two hundred forty-three million, five hundred thirty-four thousand, two hundred fifty-eight".