16685011897 has 2 divisors, whose sum is σ = 16685011898. Its totient is φ = 16685011896.

The previous prime is 16685011813. The next prime is 16685011907. The reversal of 16685011897 is 79811058661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16667068201 + 17943696 = 129101^2 + 4236^2 .

It is a cyclic number.

It is not a de Polignac number, because 16685011897 - 2⁷ = 16685011769 is a prime.

It is not a weakly prime, because it can be changed into another prime (16685011697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342505948 + 8342505949.

It is an arithmetic number, because the mean of its divisors is an integer number (8342505949).

Almost surely, 2^16685011897 is an apocalyptic number.

It is an amenable number.

16685011897 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685011897 is an equidigital number, since it uses as much as digits as its factorization.

16685011897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 16685011897 in words is "sixteen billion, six hundred eighty-five million, eleven thousand, eight hundred ninety-seven".