66700171 has 4 divisors (see below), whose sum is σ = 67290552. Its totient is φ = 66109792.

The previous prime is 66700121. The next prime is 66700177. The reversal of 66700171 is 17100766.

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 66700171 - 2¹³ = 66691979 is a prime.

It is a super-2 number, since 2×66700171² = 8897825622858482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66700177) 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, 295021 + ... + 295246.

It is an arithmetic number, because the mean of its divisors is an integer number (16822638).

Almost surely, 2^66700171 is an apocalyptic number.

66700171 is a deficient number, since it is larger than the sum of its proper divisors (590381).

66700171 is a wasteful number, since it uses less digits than its factorization.

66700171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590380.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 66700171 is about 8167.0172645832. The cubic root of 66700171 is about 405.5480483699.

The spelling of 66700171 in words is "sixty-six million, seven hundred thousand, one hundred seventy-one".