18966877866981 has 48 divisors (see below), whose sum is σ = 30252193800192. Its totient is φ = 11354740768800.

The previous prime is 18966877866971. The next prime is 18966877867013.

18966877866981 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18966877866981 - 2⁵ = 18966877866949 is a prime.

It is a super-2 number, since 2×18966877866981² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18966877866891 and 18966877866900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18966877866961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51344766 + ... + 51712848.

It is an arithmetic number, because the mean of its divisors is an integer number (630254037504).

Almost surely, 2^{18966877866981} is an apocalyptic number.

18966877866981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18966877866981 is a deficient number, since it is larger than the sum of its proper divisors (11285315933211).

18966877866981 is a wasteful number, since it uses less digits than its factorization.

18966877866981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374454 (or 374451 counting only the distinct ones).

The product of its digits is 21069103104, while the sum is 90.

The spelling of 18966877866981 in words is "eighteen trillion, nine hundred sixty-six billion, eight hundred seventy-seven million, eight hundred sixty-six thousand, nine hundred eighty-one".