667606623457171 has 4 divisors (see below), whose sum is σ = 667669528077552. Its totient is φ = 667543718836792.

The previous prime is 667606623456889. The next prime is 667606623457247. The reversal of 667606623457171 is 171754326606766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 667606623457171 - 2⁹ = 667606623456659 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667606623457097 and 667606623457106.

It is not an unprimeable number, because it can be changed into a prime (667606623457271) 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, 31452294271 + ... + 31452315496.

It is an arithmetic number, because the mean of its divisors is an integer number (166917382019388).

Almost surely, 2^{667606623457171} is an apocalyptic number.

667606623457171 is a deficient number, since it is larger than the sum of its proper divisors (62904620381).

667606623457171 is a wasteful number, since it uses less digits than its factorization.

667606623457171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62904620380.

The product of its (nonzero) digits is 320060160, while the sum is 67.

The spelling of 667606623457171 in words is "six hundred sixty-seven trillion, six hundred six billion, six hundred twenty-three million, four hundred fifty-seven thousand, one hundred seventy-one".