66653423 has 4 divisors (see below), whose sum is σ = 66969528. Its totient is φ = 66337320.

The previous prime is 66653417. The next prime is 66653429. The reversal of 66653423 is 32435666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32435666 = 2 ⋅16217833.

It is an interprime number because it is at equal distance from previous prime (66653417) and next prime (66653429).

It is a cyclic number.

It is not a de Polignac number, because 66653423 - 2⁶ = 66653359 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 (66653429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157736 + ... + 158157.

It is an arithmetic number, because the mean of its divisors is an integer number (16742382).

Almost surely, 2^66653423 is an apocalyptic number.

66653423 is a deficient number, since it is larger than the sum of its proper divisors (316105).

66653423 is a wasteful number, since it uses less digits than its factorization.

66653423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316104.

The product of its digits is 77760, while the sum is 35.

The square root of 66653423 is about 8164.1547633543. The cubic root of 66653423 is about 405.4532810414.

It can be divided in two parts, 66653 and 423, that added together give a palindrome (67076).

The spelling of 66653423 in words is "sixty-six million, six hundred fifty-three thousand, four hundred twenty-three".