66665023 has 2 divisors, whose sum is σ = 66665024. Its totient is φ = 66665022.

The previous prime is 66665021. The next prime is 66665033. The reversal of 66665023 is 32056666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66665023 - 2¹ = 66665021 is a prime.

Together with 66665021, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66665023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66665021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332511 + 33332512.

It is an arithmetic number, because the mean of its divisors is an integer number (33332512).

Almost surely, 2^66665023 is an apocalyptic number.

66665023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66665023 is an equidigital number, since it uses as much as digits as its factorization.

66665023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 66665023 is about 8164.8651550408. The cubic root of 66665023 is about 405.4768006399.

The spelling of 66665023 in words is "sixty-six million, six hundred sixty-five thousand, twenty-three".