18786331540 has 12 divisors (see below), whose sum is σ = 39451296276. Its totient is φ = 7514532608.

The previous prime is 18786331513. The next prime is 18786331637. The reversal of 18786331540 is 4513368781.

It can be written as a sum of positive squares in 2 ways, for example, as 2197921924 + 16588409616 = 46882^2 + 128796^2 .

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 3 ways as a sum of consecutive naturals, for example, 469658269 + ... + 469658308.

It is an arithmetic number, because the mean of its divisors is an integer number (3287608023).

Almost surely, 2^18786331540 is an apocalyptic number.

18786331540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18786331540 is an abundant number, since it is smaller than the sum of its proper divisors (20664964736).

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

18786331540 is a wasteful number, since it uses less digits than its factorization.

18786331540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939316586 (or 939316584 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 18786331540 in words is "eighteen billion, seven hundred eighty-six million, three hundred thirty-one thousand, five hundred forty".