17987940449327 has 2 divisors, whose sum is σ = 17987940449328. Its totient is φ = 17987940449326.

The previous prime is 17987940449279. The next prime is 17987940449393. The reversal of 17987940449327 is 72394404978971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17987940449327 - 2¹² = 17987940445231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17987940449827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8993970224663 + 8993970224664.

It is an arithmetic number, because the mean of its divisors is an integer number (8993970224664).

Almost surely, 2^{17987940449327} is an apocalyptic number.

17987940449327 is a deficient number, since it is larger than the sum of its proper divisors (1).

17987940449327 is an equidigital number, since it uses as much as digits as its factorization.

17987940449327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768144384, while the sum is 74.

The spelling of 17987940449327 in words is "seventeen trillion, nine hundred eighty-seven billion, nine hundred forty million, four hundred forty-nine thousand, three hundred twenty-seven".