665152643 has 2 divisors, whose sum is σ = 665152644. Its totient is φ = 665152642.

The previous prime is 665152561. The next prime is 665152651. The reversal of 665152643 is 346251566.

It is a happy number.

665152643 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665152643 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665152597 and 665152606.

It is not a weakly prime, because it can be changed into another prime (665152043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332576321 + 332576322.

It is an arithmetic number, because the mean of its divisors is an integer number (332576322).

Almost surely, 2^665152643 is an apocalyptic number.

665152643 is a deficient number, since it is larger than the sum of its proper divisors (1).

665152643 is an equidigital number, since it uses as much as digits as its factorization.

665152643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The square root of 665152643 is about 25790.5533674638. The cubic root of 665152643 is about 872.9186527345.

The spelling of 665152643 in words is "six hundred sixty-five million, one hundred fifty-two thousand, six hundred forty-three".