66004023 has 4 divisors (see below), whose sum is σ = 88005368. Its totient is φ = 44002680.

The previous prime is 66004019. The next prime is 66004031. The reversal of 66004023 is 32040066.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66004023 - 2² = 66004019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66004033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11000668 + ... + 11000673.

It is an arithmetic number, because the mean of its divisors is an integer number (22001342).

Almost surely, 2^66004023 is an apocalyptic number.

66004023 is a deficient number, since it is larger than the sum of its proper divisors (22001345).

66004023 is a wasteful number, since it uses less digits than its factorization.

66004023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22001344.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 66004023 is about 8124.2859993971. The cubic root of 66004023 is about 404.1322129603.

Adding to 66004023 its reverse (32040066), we get a palindrome (98044089).

The spelling of 66004023 in words is "sixty-six million, four thousand, twenty-three".