18657866875681 has 4 divisors (see below), whose sum is σ = 20354036591664. Its totient is φ = 16961697159700.

The previous prime is 18657866875667. The next prime is 18657866875699.

18657866875681 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18657866875681 - 2⁹ = 18657866875169 is a prime.

It is a super-2 number, since 2×18657866875681² (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 = 18657866875595 and 18657866875604.

It is not an unprimeable number, because it can be changed into a prime (18657866875481) 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 3 ways as a sum of consecutive naturals, for example, 848084857975 + ... + 848084857996.

It is an arithmetic number, because the mean of its divisors is an integer number (5088509147916).

Almost surely, 2^{18657866875681} is an apocalyptic number.

18657866875681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18657866875681 is a deficient number, since it is larger than the sum of its proper divisors (1696169715983).

18657866875681 is a wasteful number, since it uses less digits than its factorization.

18657866875681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696169715982.

The product of its digits is 6502809600, while the sum is 82.

The spelling of 18657866875681 in words is "eighteen trillion, six hundred fifty-seven billion, eight hundred sixty-six million, eight hundred seventy-five thousand, six hundred eighty-one".