665037071 has 2 divisors, whose sum is σ = 665037072. Its totient is φ = 665037070.

The previous prime is 665037029. The next prime is 665037073. The reversal of 665037071 is 170730566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665037071 - 2⁶ = 665037007 is a prime.

Together with 665037073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665037073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332518535 + 332518536.

It is an arithmetic number, because the mean of its divisors is an integer number (332518536).

Almost surely, 2^665037071 is an apocalyptic number.

665037071 is a deficient number, since it is larger than the sum of its proper divisors (1).

665037071 is an equidigital number, since it uses as much as digits as its factorization.

665037071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 665037071 is about 25788.3126822985. The cubic root of 665037071 is about 872.8680925114.

The spelling of 665037071 in words is "six hundred sixty-five million, thirty-seven thousand, seventy-one".