16850368681 has 2 divisors, whose sum is σ = 16850368682. Its totient is φ = 16850368680.

The previous prime is 16850368679. The next prime is 16850368697. The reversal of 16850368681 is 18686305861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15991878681 + 858490000 = 126459^2 + 29300^2 .

It is a cyclic number.

It is not a de Polignac number, because 16850368681 - 2¹ = 16850368679 is a prime.

It is a super-2 number, since 2×16850368681² (a number of 21 digits) contains 22 as substring.

Together with 16850368679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16850368621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8425184340 + 8425184341.

It is an arithmetic number, because the mean of its divisors is an integer number (8425184341).

Almost surely, 2^16850368681 is an apocalyptic number.

It is an amenable number.

16850368681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16850368681 is an equidigital number, since it uses as much as digits as its factorization.

16850368681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 16850368681 in words is "sixteen billion, eight hundred fifty million, three hundred sixty-eight thousand, six hundred eighty-one".