1665500273 has 2 divisors, whose sum is σ = 1665500274. Its totient is φ = 1665500272.

The previous prime is 1665500269. The next prime is 1665500297. The reversal of 1665500273 is 3720055661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1339047649 + 326452624 = 36593^2 + 18068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665500273 - 2² = 1665500269 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665506273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832750136 + 832750137.

It is an arithmetic number, because the mean of its divisors is an integer number (832750137).

Almost surely, 2^1665500273 is an apocalyptic number.

It is an amenable number.

1665500273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665500273 is an equidigital number, since it uses as much as digits as its factorization.

1665500273 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 35.

The square root of 1665500273 is about 40810.5411995479. The cubic root of 1665500273 is about 1185.3544544292.

The spelling of 1665500273 in words is "one billion, six hundred sixty-five million, five hundred thousand, two hundred seventy-three".