18987936552485 has 8 divisors (see below), whose sum is σ = 22874183490456. Its totient is φ = 15131242823680.

The previous prime is 18987936552451. The next prime is 18987936552503. The reversal of 18987936552485 is 58425563978981.

18987936552485 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5218478791201 + 13769457761284 = 2284399^2 + 3710722^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18987936552485 - 2⁴⁴ = 1395750508069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7388300876 + ... + 7388303445.

It is an arithmetic number, because the mean of its divisors is an integer number (2859272936307).

Almost surely, 2^{18987936552485} is an apocalyptic number.

It is an amenable number.

18987936552485 is a deficient number, since it is larger than the sum of its proper divisors (3886246937971).

18987936552485 is a wasteful number, since it uses less digits than its factorization.

18987936552485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14776604583.

The product of its digits is 5225472000, while the sum is 80.

The spelling of 18987936552485 in words is "eighteen trillion, nine hundred eighty-seven billion, nine hundred thirty-six million, five hundred fifty-two thousand, four hundred eighty-five".