16665241 has 2 divisors, whose sum is σ = 16665242. Its totient is φ = 16665240.

The previous prime is 16665221. The next prime is 16665247. The reversal of 16665241 is 14256661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15968016 + 697225 = 3996^2 + 835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16665241 is a prime.

It is not a weakly prime, because it can be changed into another prime (16665247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332620 + 8332621.

It is an arithmetic number, because the mean of its divisors is an integer number (8332621).

Almost surely, 2^16665241 is an apocalyptic number.

It is an amenable number.

16665241 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665241 is an equidigital number, since it uses as much as digits as its factorization.

16665241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 16665241 is about 4082.3082931107. The cubic root of 16665241 is about 255.4291939114.

The spelling of 16665241 in words is "sixteen million, six hundred sixty-five thousand, two hundred forty-one".