665697023 has 2 divisors, whose sum is σ = 665697024. Its totient is φ = 665697022.

The previous prime is 665696963. The next prime is 665697029. The reversal of 665697023 is 320796566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665697023 - 2²⁰ = 664648447 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665697029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332848511 + 332848512.

It is an arithmetic number, because the mean of its divisors is an integer number (332848512).

Almost surely, 2^665697023 is an apocalyptic number.

665697023 is a deficient number, since it is larger than the sum of its proper divisors (1).

665697023 is an equidigital number, since it uses as much as digits as its factorization.

665697023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 665697023 is about 25801.1050732328. The cubic root of 665697023 is about 873.1567283507.

The spelling of 665697023 in words is "six hundred sixty-five million, six hundred ninety-seven thousand, twenty-three".