18087121855 has 8 divisors (see below), whose sum is σ = 23677686864. Its totient is φ = 13154270400.

The previous prime is 18087121817. The next prime is 18087121859. The reversal of 18087121855 is 55812178081.

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

It is not a de Polignac number, because 18087121855 - 2¹¹ = 18087119807 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 (18087121859) 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 7 ways as a sum of consecutive naturals, for example, 164428326 + ... + 164428435.

It is an arithmetic number, because the mean of its divisors is an integer number (2959710858).

Almost surely, 2^18087121855 is an apocalyptic number.

18087121855 is a deficient number, since it is larger than the sum of its proper divisors (5590565009).

18087121855 is a wasteful number, since it uses less digits than its factorization.

18087121855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328856777.

The product of its (nonzero) digits is 179200, while the sum is 46.

The spelling of 18087121855 in words is "eighteen billion, eighty-seven million, one hundred twenty-one thousand, eight hundred fifty-five".