18885449087 has 4 divisors (see below), whose sum is σ = 18926415816. Its totient is φ = 18844482360.

The previous prime is 18885449059. The next prime is 18885449119. The reversal of 18885449087 is 78094458881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18885449087 - 2¹⁴ = 18885432703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18885440087) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 20482673 + ... + 20483594.

It is an arithmetic number, because the mean of its divisors is an integer number (4731603954).

Almost surely, 2^18885449087 is an apocalyptic number.

18885449087 is a deficient number, since it is larger than the sum of its proper divisors (40966729).

18885449087 is an equidigital number, since it uses as much as digits as its factorization.

18885449087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40966728.

The product of its (nonzero) digits is 20643840, while the sum is 62.

The spelling of 18885449087 in words is "eighteen billion, eight hundred eighty-five million, four hundred forty-nine thousand, eighty-seven".