16641697 has 2 divisors, whose sum is σ = 16641698. Its totient is φ = 16641696.

The previous prime is 16641649. The next prime is 16641707. The reversal of 16641697 is 79614661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11806096 + 4835601 = 3436^2 + 2199^2 .

It is a cyclic number.

It is not a de Polignac number, because 16641697 - 2¹⁵ = 16608929 is a prime.

It is not a weakly prime, because it can be changed into another prime (16641617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320848 + 8320849.

It is an arithmetic number, because the mean of its divisors is an integer number (8320849).

Almost surely, 2^16641697 is an apocalyptic number.

It is an amenable number.

16641697 is a deficient number, since it is larger than the sum of its proper divisors (1).

16641697 is an equidigital number, since it uses as much as digits as its factorization.

16641697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 16641697 is about 4079.4236112471. The cubic root of 16641697 is about 255.3088504333.

The spelling of 16641697 in words is "sixteen million, six hundred forty-one thousand, six hundred ninety-seven".