18887681232016 has 45 divisors (see below), whose sum is σ = 37391680669369. Its totient is φ = 9242508005312.

The previous prime is 18887681231999. The next prime is 18887681232029. The reversal of 18887681232016 is 61023218678881.

It is a happy number.

The square root of 18887681232016 is 4345996.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14703987600 + 18872977244416 = 121260^2 + 4344304^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 817035690 + ... + 817058806.

Almost surely, 2^{18887681232016} is an apocalyptic number.

18887681232016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18887681232016 is the 4345996-th square number.

It is an amenable number.

18887681232016 is a deficient number, since it is larger than the sum of its proper divisors (18503999437353).

18887681232016 is an frugal number, since it uses more digits than its factorization.

18887681232016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46336 (or 23166 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 61.

The spelling of 18887681232016 in words is "eighteen trillion, eight hundred eighty-seven billion, six hundred eighty-one million, two hundred thirty-two thousand, sixteen".