1665006517 has 2 divisors, whose sum is σ = 1665006518. Its totient is φ = 1665006516.

The previous prime is 1665006439. The next prime is 1665006527. The reversal of 1665006517 is 7156005661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1143386596 + 521619921 = 33814^2 + 22839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665006517 - 2⁷ = 1665006389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665006527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832503258 + 832503259.

It is an arithmetic number, because the mean of its divisors is an integer number (832503259).

Almost surely, 2^1665006517 is an apocalyptic number.

It is an amenable number.

1665006517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665006517 is an equidigital number, since it uses as much as digits as its factorization.

1665006517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 1665006517 is about 40804.4913826897. The cubic root of 1665006517 is about 1185.2373057002.

The spelling of 1665006517 in words is "one billion, six hundred sixty-five million, six thousand, five hundred seventeen".