100665601 has 2 divisors, whose sum is σ = 100665602. Its totient is φ = 100665600.

The previous prime is 100665581. The next prime is 100665611. The reversal of 100665601 is 106566001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 49914225 = 7124^2 + 7065^2 .

It is a cyclic number.

It is not a de Polignac number, because 100665601 - 2¹⁹ = 100141313 is a prime.

It is not a weakly prime, because it can be changed into another prime (100665611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50332800 + 50332801.

It is an arithmetic number, because the mean of its divisors is an integer number (50332801).

Almost surely, 2^100665601 is an apocalyptic number.

It is an amenable number.

100665601 is a deficient number, since it is larger than the sum of its proper divisors (1).

100665601 is an equidigital number, since it uses as much as digits as its factorization.

100665601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 100665601 is about 10033.2248554490. The cubic root of 100665601 is about 465.1864223420.

The spelling of 100665601 in words is "one hundred million, six hundred sixty-five thousand, six hundred one".