17987940449279 has 2 divisors, whose sum is σ = 17987940449280. Its totient is φ = 17987940449278.

The previous prime is 17987940449261. The next prime is 17987940449327. The reversal of 17987940449279 is 97294404978971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17987940449279 - 2⁴⁴ = 395754404863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17987940449779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8993970224639 + 8993970224640.

It is an arithmetic number, because the mean of its divisors is an integer number (8993970224640).

Almost surely, 2^{17987940449279} is an apocalyptic number.

17987940449279 is a deficient number, since it is larger than the sum of its proper divisors (1).

17987940449279 is an equidigital number, since it uses as much as digits as its factorization.

17987940449279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304433152, while the sum is 80.

The spelling of 17987940449279 in words is "seventeen trillion, nine hundred eighty-seven billion, nine hundred forty million, four hundred forty-nine thousand, two hundred seventy-nine".