665266127 has 4 divisors (see below), whose sum is σ = 667795920. Its totient is φ = 662736336.

The previous prime is 665266079. The next prime is 665266139. The reversal of 665266127 is 721662566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665266127 - 2¹⁴ = 665249743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665266157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264502 + ... + 1265027.

It is an arithmetic number, because the mean of its divisors is an integer number (166948980).

Almost surely, 2^665266127 is an apocalyptic number.

665266127 is a deficient number, since it is larger than the sum of its proper divisors (2529793).

665266127 is a wasteful number, since it uses less digits than its factorization.

665266127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529792.

The product of its digits is 181440, while the sum is 41.

The square root of 665266127 is about 25792.7533815217. The cubic root of 665266127 is about 872.9682938047.

The spelling of 665266127 in words is "six hundred sixty-five million, two hundred sixty-six thousand, one hundred twenty-seven".