18687603788416 has 32 divisors (see below), whose sum is σ = 37234149501780. Its totient is φ = 9342562344960.

The previous prime is 18687603788387. The next prime is 18687603788449. The reversal of 18687603788416 is 61488730678681.

It can be written as a sum of positive squares in 2 ways, for example, as 18270153409600 + 417450378816 = 4274360^2 + 646104^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8714961 + ... + 10645456.

Almost surely, 2^{18687603788416} is an apocalyptic number.

18687603788416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18687603788416 is a deficient number, since it is larger than the sum of its proper divisors (18546545713364).

18687603788416 is an equidigital number, since it uses as much as digits as its factorization.

18687603788416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19367972 (or 19367960 counting only the distinct ones).

The product of its (nonzero) digits is 520224768, while the sum is 73.

The spelling of 18687603788416 in words is "eighteen trillion, six hundred eighty-seven billion, six hundred three million, seven hundred eighty-eight thousand, four hundred sixteen".