16777335661 has 4 divisors (see below), whose sum is σ = 16925807772. Its totient is φ = 16628863552.

The previous prime is 16777335569. The next prime is 16777335677. The reversal of 16777335661 is 16653377761.

16777335661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16653377761 = 41911 ⋅397351.

It can be written as a sum of positive squares in 2 ways, for example, as 4806787561 + 11970548100 = 69331^2 + 109410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16777335661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16777335599 and 16777335608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16777335161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74235886 + ... + 74236111.

It is an arithmetic number, because the mean of its divisors is an integer number (4231451943).

Almost surely, 2^16777335661 is an apocalyptic number.

It is an amenable number.

16777335661 is a deficient number, since it is larger than the sum of its proper divisors (148472111).

16777335661 is a wasteful number, since it uses less digits than its factorization.

16777335661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148472110.

The product of its digits is 3333960, while the sum is 52.

The spelling of 16777335661 in words is "sixteen billion, seven hundred seventy-seven million, three hundred thirty-five thousand, six hundred sixty-one".