18878673251 has 2 divisors, whose sum is σ = 18878673252. Its totient is φ = 18878673250.

The previous prime is 18878673223. The next prime is 18878673269. The reversal of 18878673251 is 15237687881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18878673251 is a prime.

It is not a weakly prime, because it can be changed into another prime (18878673221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439336625 + 9439336626.

It is an arithmetic number, because the mean of its divisors is an integer number (9439336626).

Almost surely, 2^18878673251 is an apocalyptic number.

18878673251 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878673251 is an equidigital number, since it uses as much as digits as its factorization.

18878673251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4515840, while the sum is 56.

The spelling of 18878673251 in words is "eighteen billion, eight hundred seventy-eight million, six hundred seventy-three thousand, two hundred fifty-one".