16685712877 has 2 divisors, whose sum is σ = 16685712878. Its totient is φ = 16685712876.

The previous prime is 16685712859. The next prime is 16685712889. The reversal of 16685712877 is 77821758661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8445793801 + 8239919076 = 91901^2 + 90774^2 .

It is an emirp because it is prime and its reverse (77821758661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16685712877 - 2¹¹ = 16685710829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16685712577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342856438 + 8342856439.

It is an arithmetic number, because the mean of its divisors is an integer number (8342856439).

Almost surely, 2^16685712877 is an apocalyptic number.

It is an amenable number.

16685712877 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685712877 is an equidigital number, since it uses as much as digits as its factorization.

16685712877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7902720, while the sum is 58.

The spelling of 16685712877 in words is "sixteen billion, six hundred eighty-five million, seven hundred twelve thousand, eight hundred seventy-seven".