18378677687381 has 16 divisors (see below), whose sum is σ = 21237235034688. Its totient is φ = 15718858425600.

The previous prime is 18378677687371. The next prime is 18378677687389.

18378677687381 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18378677687381 - 2¹⁸ = 18378677425237 is a prime.

It is a super-2 number, since 2×18378677687381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18378677687296 and 18378677687305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378677687389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18942290 + ... + 19888883.

It is an arithmetic number, because the mean of its divisors is an integer number (1327327189668).

Almost surely, 2^{18378677687381} is an apocalyptic number.

18378677687381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18378677687381 is a deficient number, since it is larger than the sum of its proper divisors (2858557347307).

18378677687381 is a wasteful number, since it uses less digits than its factorization.

18378677687381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38833732.

The product of its digits is 3186376704, while the sum is 80.

The spelling of 18378677687381 in words is "eighteen trillion, three hundred seventy-eight billion, six hundred seventy-seven million, six hundred eighty-seven thousand, three hundred eighty-one".