18682028681 has 4 divisors (see below), whose sum is σ = 18866999364. Its totient is φ = 18497058000.

The previous prime is 18682028663. The next prime is 18682028753.

It is a happy number.

18682028681 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14462227081 + 4219801600 = 120259^2 + 64960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18682028681 is a prime.

It is a super-2 number, since 2×18682028681² (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 (18682028611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92485190 + ... + 92485391.

It is an arithmetic number, because the mean of its divisors is an integer number (4716749841).

Almost surely, 2^18682028681 is an apocalyptic number.

It is an amenable number.

18682028681 is a deficient number, since it is larger than the sum of its proper divisors (184970683).

18682028681 is a wasteful number, since it uses less digits than its factorization.

18682028681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184970682.

The product of its (nonzero) digits is 589824, while the sum is 50.

The spelling of 18682028681 in words is "eighteen billion, six hundred eighty-two million, twenty-eight thousand, six hundred eighty-one".