16685712577 has 2 divisors, whose sum is σ = 16685712578. Its totient is φ = 16685712576.

The previous prime is 16685712541. The next prime is 16685712643. The reversal of 16685712577 is 77521758661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15368312961 + 1317399616 = 123969^2 + 36296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16685712577 is a prime.

It is not a weakly prime, because it can be changed into another prime (16685712877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342856288 + 8342856289.

It is an arithmetic number, because the mean of its divisors is an integer number (8342856289).

Almost surely, 2^16685712577 is an apocalyptic number.

It is an amenable number.

16685712577 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685712577 is an equidigital number, since it uses as much as digits as its factorization.

16685712577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4939200, while the sum is 55.

The spelling of 16685712577 in words is "sixteen billion, six hundred eighty-five million, seven hundred twelve thousand, five hundred seventy-seven".