18405337853 has 4 divisors (see below), whose sum is σ = 21034671840. Its totient is φ = 15776003868.

The previous prime is 18405337843. The next prime is 18405337901. The reversal of 18405337853 is 35873350481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35873350481 = 37 ⋅969550013.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18405337853 is a prime.

It is a super-2 number, since 2×18405337853² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18405337798 and 18405337807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18405337843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314666983 + ... + 1314666996.

It is an arithmetic number, because the mean of its divisors is an integer number (5258667960).

Almost surely, 2^18405337853 is an apocalyptic number.

It is an amenable number.

18405337853 is a deficient number, since it is larger than the sum of its proper divisors (2629333987).

18405337853 is an equidigital number, since it uses as much as digits as its factorization.

18405337853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629333986.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 18405337853 in words is "eighteen billion, four hundred five million, three hundred thirty-seven thousand, eight hundred fifty-three".