16985777 has 4 divisors (see below), whose sum is σ = 17017716. Its totient is φ = 16953840.

The previous prime is 16985747. The next prime is 16985803. The reversal of 16985777 is 77758961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77758961 = 7 ⋅11108423.

It can be written as a sum of positive squares in 2 ways, for example, as 6974881 + 10010896 = 2641^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 16985777 - 2¹⁰ = 16984753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16985747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15158 + ... + 16239.

It is an arithmetic number, because the mean of its divisors is an integer number (4254429).

Almost surely, 2^16985777 is an apocalyptic number.

It is an amenable number.

16985777 is a deficient number, since it is larger than the sum of its proper divisors (31939).

16985777 is an equidigital number, since it uses as much as digits as its factorization.

16985777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31938.

The product of its digits is 740880, while the sum is 50.

The square root of 16985777 is about 4121.3804726087. The cubic root of 16985777 is about 257.0564305523.

The spelling of 16985777 in words is "sixteen million, nine hundred eighty-five thousand, seven hundred seventy-seven".