16776997 has 4 divisors (see below), whose sum is σ = 16925580. Its totient is φ = 16628416.

The previous prime is 16776989. The next prime is 16777027. The reversal of 16776997 is 79967761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1985281 + 14791716 = 1409^2 + 3846^2 .

It is a cyclic number.

It is not a de Polignac number, because 16776997 - 2³ = 16776989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16776937) 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, 74122 + ... + 74347.

It is an arithmetic number, because the mean of its divisors is an integer number (4231395).

Almost surely, 2^16776997 is an apocalyptic number.

It is an amenable number.

16776997 is a deficient number, since it is larger than the sum of its proper divisors (148583).

16776997 is a wasteful number, since it uses less digits than its factorization.

16776997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148582.

The product of its digits is 1000188, while the sum is 52.

The square root of 16776997 is about 4095.9732665143. The cubic root of 16776997 is about 255.9988861036.

The spelling of 16776997 in words is "sixteen million, seven hundred seventy-six thousand, nine hundred ninety-seven".