18867117881 has 8 divisors (see below), whose sum is σ = 19243854240. Its totient is φ = 18492280128.

The previous prime is 18867117853. The next prime is 18867117911. The reversal of 18867117881 is 18871176881.

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 18867117881 - 2¹⁰ = 18867116857 is a prime.

It is a super-2 number, since 2×18867117881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18867117821) 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, 454571 + ... + 494336.

It is an arithmetic number, because the mean of its divisors is an integer number (2405481780).

Almost surely, 2^18867117881 is an apocalyptic number.

It is an amenable number.

18867117881 is a deficient number, since it is larger than the sum of its proper divisors (376736359).

18867117881 is an equidigital number, since it uses as much as digits as its factorization.

18867117881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949303.

The product of its digits is 1204224, while the sum is 56.

The spelling of 18867117881 in words is "eighteen billion, eight hundred sixty-seven million, one hundred seventeen thousand, eight hundred eighty-one".