66565023 has 16 divisors (see below), whose sum is σ = 102333696. Its totient is φ = 37699200.

The previous prime is 66565007. The next prime is 66565043. The reversal of 66565023 is 32056566.

It is not a de Polignac number, because 66565023 - 2⁴ = 66565007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11653 + ... + 16398.

It is an arithmetic number, because the mean of its divisors is an integer number (6395856).

Almost surely, 2^66565023 is an apocalyptic number.

66565023 is a deficient number, since it is larger than the sum of its proper divisors (35768673).

66565023 is a wasteful number, since it uses less digits than its factorization.

66565023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28174.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 66565023 is about 8158.7390569867. The cubic root of 66565023 is about 405.2739557822.

The spelling of 66565023 in words is "sixty-six million, five hundred sixty-five thousand, twenty-three".