66836423 has 4 divisors (see below), whose sum is σ = 66892560. Its totient is φ = 66780288.

The previous prime is 66836411. The next prime is 66836443. The reversal of 66836423 is 32463866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32463866 = 2 ⋅16231933.

It is a cyclic number.

It is not a de Polignac number, because 66836423 - 2¹⁰ = 66835399 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 (66836443) 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, 26243 + ... + 28676.

It is an arithmetic number, because the mean of its divisors is an integer number (16723140).

Almost surely, 2^66836423 is an apocalyptic number.

66836423 is a deficient number, since it is larger than the sum of its proper divisors (56137).

66836423 is a wasteful number, since it uses less digits than its factorization.

66836423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56136.

The product of its digits is 124416, while the sum is 38.

The square root of 66836423 is about 8175.3546100460. The cubic root of 66836423 is about 405.8240054337.

The spelling of 66836423 in words is "sixty-six million, eight hundred thirty-six thousand, four hundred twenty-three".