16669957852777 has 2 divisors, whose sum is σ = 16669957852778. Its totient is φ = 16669957852776.

The previous prime is 16669957852771. The next prime is 16669957852817. The reversal of 16669957852777 is 77725875996661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9685888430656 + 6984069422121 = 3112216^2 + 2642739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16669957852777 is a prime.

It is a super-2 number, since 2×16669957852777² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16669957852694 and 16669957852703.

It is not a weakly prime, because it can be changed into another prime (16669957852771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334978926388 + 8334978926389.

It is an arithmetic number, because the mean of its divisors is an integer number (8334978926389).

Almost surely, 2^{16669957852777} is an apocalyptic number.

It is an amenable number.

16669957852777 is a deficient number, since it is larger than the sum of its proper divisors (1).

16669957852777 is an equidigital number, since it uses as much as digits as its factorization.

16669957852777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16803158400, while the sum is 85.

The spelling of 16669957852777 in words is "sixteen trillion, six hundred sixty-nine billion, nine hundred fifty-seven million, eight hundred fifty-two thousand, seven hundred seventy-seven".