16987839422978 has 18 divisors (see below), whose sum is σ = 25868355075171. Its totient is φ = 8366952437844.

The previous prime is 16987839422933. The next prime is 16987839422987. The reversal of 16987839422978 is 87922493878961.

It can be written as a sum of positive squares in only one way, i.e., 8493919711489 + 8493919711489 = 2914433^2 + 2914433^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2914433.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16987839422896 and 16987839422905.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 390512273 + ... + 390555771.

Almost surely, 2^{16987839422978} is an apocalyptic number.

16987839422978 is a deficient number, since it is larger than the sum of its proper divisors (8880515652193).

16987839422978 is an frugal number, since it uses more digits than its factorization.

16987839422978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87134 (or 43568 counting only the distinct ones).

The product of its digits is 5267275776, while the sum is 83.

The spelling of 16987839422978 in words is "sixteen trillion, nine hundred eighty-seven billion, eight hundred thirty-nine million, four hundred twenty-two thousand, nine hundred seventy-eight".