66411171 has 14 divisors (see below), whose sum is σ = 99572300. Its totient is φ = 44273628.

The previous prime is 66411151. The next prime is 66411203. The reversal of 66411171 is 17111466.

66411171 is a `hidden beast` number, since 6 + 641 + 1 + 17 + 1 = 666.

It is not a de Polignac number, because 66411171 - 2⁵ = 66411139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66411151) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 44821 + ... + 46278.

Almost surely, 2^66411171 is an apocalyptic number.

66411171 is a deficient number, since it is larger than the sum of its proper divisors (33161129).

66411171 is an frugal number, since it uses more digits than its factorization.

66411171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91117 (or 91102 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 66411171 is about 8149.3049396866. The cubic root of 66411171 is about 404.9614778175.

The spelling of 66411171 in words is "sixty-six million, four hundred eleven thousand, one hundred seventy-one".