18686866837 has 8 divisors (see below), whose sum is σ = 19787506200. Its totient is φ = 17586384384.

The previous prime is 18686866813. The next prime is 18686866853. The reversal of 18686866837 is 73866868681.

It can be written as a sum of positive squares in 4 ways, for example, as 13224770001 + 5462096836 = 114999^2 + 73906^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18686866837 - 2²³ = 18678478229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686863837) 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 7 ways as a sum of consecutive naturals, for example, 280489 + ... + 340657.

It is an arithmetic number, because the mean of its divisors is an integer number (2473438275).

Almost surely, 2^18686866837 is an apocalyptic number.

18686866837 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18686866837 is a deficient number, since it is larger than the sum of its proper divisors (1100639363).

18686866837 is a wasteful number, since it uses less digits than its factorization.

18686866837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78455.

The product of its digits is 111476736, while the sum is 67.

The spelling of 18686866837 in words is "eighteen billion, six hundred eighty-six million, eight hundred sixty-six thousand, eight hundred thirty-seven".