17987940445231 has 2 divisors, whose sum is σ = 17987940445232. Its totient is φ = 17987940445230.

The previous prime is 17987940445207. The next prime is 17987940445259. The reversal of 17987940445231 is 13254404978971.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17987940445231 is a prime.

It is a super-2 number, since 2×17987940445231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17987940445031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8993970222615 + 8993970222616.

It is an arithmetic number, because the mean of its divisors is an integer number (8993970222616).

Almost surely, 2^{17987940445231} is an apocalyptic number.

17987940445231 is a deficient number, since it is larger than the sum of its proper divisors (1).

17987940445231 is an equidigital number, since it uses as much as digits as its factorization.

17987940445231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 17987940445231 in words is "seventeen trillion, nine hundred eighty-seven billion, nine hundred forty million, four hundred forty-five thousand, two hundred thirty-one".