18361533343 has 4 divisors (see below), whose sum is σ = 18364668840. Its totient is φ = 18358397848.

The previous prime is 18361533313. The next prime is 18361533347. The reversal of 18361533343 is 34333516381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34333516381 = 67 ⋅512440543.

It is a cyclic number.

It is not a de Polignac number, because 18361533343 - 2¹⁷ = 18361402271 is a prime.

It is a super-2 number, since 2×18361533343² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18361533296 and 18361533305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361533347) 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 3 ways as a sum of consecutive naturals, for example, 1558948 + ... + 1570681.

It is an arithmetic number, because the mean of its divisors is an integer number (4591167210).

Almost surely, 2^18361533343 is an apocalyptic number.

18361533343 is a deficient number, since it is larger than the sum of its proper divisors (3135497).

18361533343 is an equidigital number, since it uses as much as digits as its factorization.

18361533343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135496.

The product of its digits is 233280, while the sum is 40.

The spelling of 18361533343 in words is "eighteen billion, three hundred sixty-one million, five hundred thirty-three thousand, three hundred forty-three".