665611351 has 2 divisors, whose sum is σ = 665611352. Its totient is φ = 665611350.

The previous prime is 665611301. The next prime is 665611357. The reversal of 665611351 is 153116566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665611351 - 2⁷ = 665611223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665611357) 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, 332805675 + 332805676.

It is an arithmetic number, because the mean of its divisors is an integer number (332805676).

Almost surely, 2^665611351 is an apocalyptic number.

665611351 is a deficient number, since it is larger than the sum of its proper divisors (1).

665611351 is an equidigital number, since it uses as much as digits as its factorization.

665611351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 665611351 is about 25799.4447808475. Note that the first 3 decimals coincide. The cubic root of 665611351 is about 873.1192697222.

The spelling of 665611351 in words is "six hundred sixty-five million, six hundred eleven thousand, three hundred fifty-one".