18846664881 has 12 divisors (see below), whose sum is σ = 27621008016. Its totient is φ = 11422220920.

The previous prime is 18846664871. The next prime is 18846664891.

18846664881 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (18846664871) and next prime (18846664891).

It is not a de Polignac number, because 18846664881 - 2⁵ = 18846664849 is a prime.

It is a super-2 number, since 2×18846664881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18846664841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25959231 + ... + 25959956.

It is an arithmetic number, because the mean of its divisors is an integer number (2301750668).

Almost surely, 2^18846664881 is an apocalyptic number.

18846664881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18846664881 is a deficient number, since it is larger than the sum of its proper divisors (8774343135).

18846664881 is a wasteful number, since it uses less digits than its factorization.

18846664881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51919212 (or 51919201 counting only the distinct ones).

The product of its digits is 14155776, while the sum is 60.

The spelling of 18846664881 in words is "eighteen billion, eight hundred forty-six million, six hundred sixty-four thousand, eight hundred eighty-one".