66626143 has 4 divisors (see below), whose sum is σ = 66780448. Its totient is φ = 66471840.

The previous prime is 66626123. The next prime is 66626173. The reversal of 66626143 is 34162666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34162666 = 2 ⋅17081333.

It is a cyclic number.

It is not a de Polignac number, because 66626143 - 2⁹ = 66625631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66626099 and 66626108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66626113) 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, 76503 + ... + 77368.

It is an arithmetic number, because the mean of its divisors is an integer number (16695112).

Almost surely, 2^66626143 is an apocalyptic number.

66626143 is a deficient number, since it is larger than the sum of its proper divisors (154305).

66626143 is a wasteful number, since it uses less digits than its factorization.

66626143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154304.

The product of its digits is 31104, while the sum is 34.

The square root of 66626143 is about 8162.4838744098. The cubic root of 66626143 is about 405.3979586772.

The spelling of 66626143 in words is "sixty-six million, six hundred twenty-six thousand, one hundred forty-three".