18987354849 has 8 divisors (see below), whose sum is σ = 25329470400. Its totient is φ = 12651737936.

The previous prime is 18987354833. The next prime is 18987354871. The reversal of 18987354849 is 94845378981.

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

It is a cyclic number.

It is not a de Polignac number, because 18987354849 - 2⁴ = 18987354833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18987354849.

It is not an unprimeable number, because it can be changed into a prime (18987354829) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1617837 + ... + 1629530.

It is an arithmetic number, because the mean of its divisors is an integer number (3166183800).

Almost surely, 2^18987354849 is an apocalyptic number.

It is an amenable number.

18987354849 is a deficient number, since it is larger than the sum of its proper divisors (6342115551).

18987354849 is a wasteful number, since it uses less digits than its factorization.

18987354849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249319.

The product of its digits is 69672960, while the sum is 66.

It can be divided in two parts, 18987354 and 849, that added together give a triangular number (18988203 = T₆₁₆₂).

The spelling of 18987354849 in words is "eighteen billion, nine hundred eighty-seven million, three hundred fifty-four thousand, eight hundred forty-nine".