66823423 has 4 divisors (see below), whose sum is σ = 66841200. Its totient is φ = 66805648.

The previous prime is 66823411. The next prime is 66823433. The reversal of 66823423 is 32432866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32432866 = 2 ⋅16216433.

It is a cyclic number.

It is not a de Polignac number, because 66823423 - 2⁹ = 66822911 is a prime.

It is a super-2 number, since 2×66823423² = 8930739722873858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66823433) 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, 790 + ... + 11587.

It is an arithmetic number, because the mean of its divisors is an integer number (16710300).

Almost surely, 2^66823423 is an apocalyptic number.

66823423 is a deficient number, since it is larger than the sum of its proper divisors (17777).

66823423 is a wasteful number, since it uses less digits than its factorization.

66823423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17776.

The product of its digits is 41472, while the sum is 34.

The square root of 66823423 is about 8174.5594988354. The cubic root of 66823423 is about 405.7976921656.

The spelling of 66823423 in words is "sixty-six million, eight hundred twenty-three thousand, four hundred twenty-three".