17987976893 has 2 divisors, whose sum is σ = 17987976894. Its totient is φ = 17987976892.

The previous prime is 17987976883. The next prime is 17987976967. The reversal of 17987976893 is 39867978971.

It is an a-pointer prime, because the next prime (17987976967) can be obtained adding 17987976893 to its sum of digits (74).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16109447929 + 1878528964 = 126923^2 + 43342^2 .

It is a cyclic number.

It is not a de Polignac number, because 17987976893 - 2⁶ = 17987976829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17987976893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17987976833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8993988446 + 8993988447.

It is an arithmetic number, because the mean of its divisors is an integer number (8993988447).

Almost surely, 2^17987976893 is an apocalyptic number.

It is an amenable number.

17987976893 is a deficient number, since it is larger than the sum of its proper divisors (1).

17987976893 is an equidigital number, since it uses as much as digits as its factorization.

17987976893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288054144, while the sum is 74.

The spelling of 17987976893 in words is "seventeen billion, nine hundred eighty-seven million, nine hundred seventy-six thousand, eight hundred ninety-three".