665054993 has 2 divisors, whose sum is σ = 665054994. Its totient is φ = 665054992.

The previous prime is 665054987. The next prime is 665055019. The reversal of 665054993 is 399450566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515653264 + 149401729 = 22708^2 + 12223^2 .

It is a cyclic number.

It is not a de Polignac number, because 665054993 - 2⁸ = 665054737 is a prime.

It is not a weakly prime, because it can be changed into another prime (665054293) 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, 332527496 + 332527497.

It is an arithmetic number, because the mean of its divisors is an integer number (332527497).

Almost surely, 2^665054993 is an apocalyptic number.

It is an amenable number.

665054993 is a deficient number, since it is larger than the sum of its proper divisors (1).

665054993 is an equidigital number, since it uses as much as digits as its factorization.

665054993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 47.

The square root of 665054993 is about 25788.6601629476. The cubic root of 665054993 is about 872.8759333782.

The spelling of 665054993 in words is "six hundred sixty-five million, fifty-four thousand, nine hundred ninety-three".