17978132251 has 2 divisors, whose sum is σ = 17978132252. Its totient is φ = 17978132250.

The previous prime is 17978132243. The next prime is 17978132299. The reversal of 17978132251 is 15223187971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17978132251 - 2³ = 17978132243 is a prime.

It is not a weakly prime, because it can be changed into another prime (17978132201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8989066125 + 8989066126.

It is an arithmetic number, because the mean of its divisors is an integer number (8989066126).

Almost surely, 2^17978132251 is an apocalyptic number.

17978132251 is a deficient number, since it is larger than the sum of its proper divisors (1).

17978132251 is an equidigital number, since it uses as much as digits as its factorization.

17978132251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 46.

The spelling of 17978132251 in words is "seventeen billion, nine hundred seventy-eight million, one hundred thirty-two thousand, two hundred fifty-one".