665995763 has 2 divisors, whose sum is σ = 665995764. Its totient is φ = 665995762.

The previous prime is 665995703. The next prime is 665995769. The reversal of 665995763 is 367599566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665995763 - 2⁶ = 665995699 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665995699 and 665995708.

It is not a weakly prime, because it can be changed into another prime (665995769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332997881 + 332997882.

It is an arithmetic number, because the mean of its divisors is an integer number (332997882).

Almost surely, 2^665995763 is an apocalyptic number.

665995763 is a deficient number, since it is larger than the sum of its proper divisors (1).

665995763 is an equidigital number, since it uses as much as digits as its factorization.

665995763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9185400, while the sum is 56.

The square root of 665995763 is about 25806.8937107898. The cubic root of 665995763 is about 873.2873222106.

The spelling of 665995763 in words is "six hundred sixty-five million, nine hundred ninety-five thousand, seven hundred sixty-three".