16851669697 has 2 divisors, whose sum is σ = 16851669698. Its totient is φ = 16851669696.

The previous prime is 16851669691. The next prime is 16851669727. The reversal of 16851669697 is 79696615861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9890103601 + 6961566096 = 99449^2 + 83436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16851669697 is a prime.

It is a super-3 number, since 3×16851669697³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16851669691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8425834848 + 8425834849.

It is an arithmetic number, because the mean of its divisors is an integer number (8425834849).

Almost surely, 2^16851669697 is an apocalyptic number.

It is an amenable number.

16851669697 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851669697 is an equidigital number, since it uses as much as digits as its factorization.

16851669697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29393280, while the sum is 64.

The spelling of 16851669697 in words is "sixteen billion, eight hundred fifty-one million, six hundred sixty-nine thousand, six hundred ninety-seven".