16559994394 has 8 divisors (see below), whose sum is σ = 24948463860. Its totient is φ = 8243839776.

The previous prime is 16559994391. The next prime is 16559994397. The reversal of 16559994394 is 49349995561.

It is an interprime number because it is at equal distance from previous prime (16559994391) and next prime (16559994397).

It can be written as a sum of positive squares in 2 ways, for example, as 10534353769 + 6025640625 = 102637^2 + 77625^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16559994394² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16559994391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18078139 + ... + 18079054.

Almost surely, 2^16559994394 is an apocalyptic number.

16559994394 is a deficient number, since it is larger than the sum of its proper divisors (8388469466).

16559994394 is a wasteful number, since it uses less digits than its factorization.

16559994394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36157424.

The product of its digits is 47239200, while the sum is 64.

The spelling of 16559994394 in words is "sixteen billion, five hundred fifty-nine million, nine hundred ninety-four thousand, three hundred ninety-four".