66171123 has 12 divisors (see below), whose sum is σ = 101203128. Its totient is φ = 41519040.

The previous prime is 66171107. The next prime is 66171151. The reversal of 66171123 is 32117166.

It is not a de Polignac number, because 66171123 - 2⁴ = 66171107 is a prime.

It is a super-2 number, since 2×66171123² = 8757235038162258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66171103) 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, 216093 + ... + 216398.

It is an arithmetic number, because the mean of its divisors is an integer number (8433594).

Almost surely, 2^66171123 is an apocalyptic number.

66171123 is a deficient number, since it is larger than the sum of its proper divisors (35032005).

66171123 is a wasteful number, since it uses less digits than its factorization.

66171123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432514 (or 432511 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 66171123 is about 8134.5634793761. The cubic root of 66171123 is about 404.4729678698.

Adding to 66171123 its reverse (32117166), we get a palindrome (98288289).

The spelling of 66171123 in words is "sixty-six million, one hundred seventy-one thousand, one hundred twenty-three".