18211439052 has 18 divisors (see below), whose sum is σ = 46034471028. Its totient is φ = 6070479672.

The previous prime is 18211439047. The next prime is 18211439083. The reversal of 18211439052 is 25093411281.

18211439052 is a `hidden beast` number, since 1 + 8 + 211 + 4 + 390 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 505873307 = 18211439052 / (1 + 8 + 2 + 1 + 1 + 4 + 3 + 9 + 0 + 5 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 18211438998 and 18211439016.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 252936618 + ... + 252936689.

Almost surely, 2^18211439052 is an apocalyptic number.

18211439052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18211439052 is an abundant number, since it is smaller than the sum of its proper divisors (27823031976).

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

18211439052 is a wasteful number, since it uses less digits than its factorization.

18211439052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505873317 (or 505873312 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 18211439052 in words is "eighteen billion, two hundred eleven million, four hundred thirty-nine thousand, fifty-two".