18705404052 has 36 divisors (see below), whose sum is σ = 47628249396. Its totient is φ = 6189621120.

The previous prime is 18705404033. The next prime is 18705404077. The reversal of 18705404052 is 25040450781.

18705404052 is a `hidden beast` number, since 1 + 8 + 70 + 540 + 40 + 5 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10577299716 + 8128104336 = 102846^2 + 90156^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18705403998 and 18705404016.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1891399 + ... + 1901262.

Almost surely, 2^18705404052 is an apocalyptic number.

18705404052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18705404052 is an abundant number, since it is smaller than the sum of its proper divisors (28922845344).

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

18705404052 is a wasteful number, since it uses less digits than its factorization.

18705404052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792808 (or 3792803 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 18705404052 in words is "eighteen billion, seven hundred five million, four hundred four thousand, fifty-two".