18878673137 has 2 divisors, whose sum is σ = 18878673138. Its totient is φ = 18878673136.

The previous prime is 18878673127. The next prime is 18878673139. The reversal of 18878673137 is 73137687881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18731754496 + 146918641 = 136864^2 + 12121^2 .

It is an emirp because it is prime and its reverse (73137687881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18878673137 - 2¹² = 18878669041 is a prime.

Together with 18878673139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18878673139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439336568 + 9439336569.

It is an arithmetic number, because the mean of its divisors is an integer number (9439336569).

Almost surely, 2^18878673137 is an apocalyptic number.

It is an amenable number.

18878673137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878673137 is an equidigital number, since it uses as much as digits as its factorization.

18878673137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 59.

The spelling of 18878673137 in words is "eighteen billion, eight hundred seventy-eight million, six hundred seventy-three thousand, one hundred thirty-seven".