66629171 has 12 divisors (see below), whose sum is σ = 82067688. Its totient is φ = 53750592.

The previous prime is 66629117. The next prime is 66629243. The reversal of 66629171 is 17192666.

It is not a de Polignac number, because 66629171 - 2¹⁸ = 66367027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66629111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39161 + ... + 40826.

It is an arithmetic number, because the mean of its divisors is an integer number (6838974).

Almost surely, 2^66629171 is an apocalyptic number.

66629171 is a deficient number, since it is larger than the sum of its proper divisors (15438517).

66629171 is a wasteful number, since it uses less digits than its factorization.

66629171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80018 (or 80011 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 66629171 is about 8162.6693550578. The cubic root of 66629171 is about 405.4041000424.

The spelling of 66629171 in words is "sixty-six million, six hundred twenty-nine thousand, one hundred seventy-one".