665487793 has 2 divisors, whose sum is σ = 665487794. Its totient is φ = 665487792.

The previous prime is 665487743. The next prime is 665487821. The reversal of 665487793 is 397784566.

It is a happy number.

665487793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338854464 + 326633329 = 18408^2 + 18073^2 .

It is a cyclic number.

It is not a de Polignac number, because 665487793 - 2⁹ = 665487281 is a prime.

It is not a weakly prime, because it can be changed into another prime (665487703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332743896 + 332743897.

It is an arithmetic number, because the mean of its divisors is an integer number (332743897).

Almost surely, 2^665487793 is an apocalyptic number.

It is an amenable number.

665487793 is a deficient number, since it is larger than the sum of its proper divisors (1).

665487793 is an equidigital number, since it uses as much as digits as its factorization.

665487793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 55.

The square root of 665487793 is about 25797.0500832944. The cubic root of 665487793 is about 873.0652404219.

The spelling of 665487793 in words is "six hundred sixty-five million, four hundred eighty-seven thousand, seven hundred ninety-three".