66207071 has 4 divisors (see below), whose sum is σ = 75665232. Its totient is φ = 56748912.

The previous prime is 66207049. The next prime is 66207073. The reversal of 66207071 is 17070266.

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 66207071 - 2²² = 62012767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66207073) 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, 4729070 + ... + 4729083.

It is an arithmetic number, because the mean of its divisors is an integer number (18916308).

Almost surely, 2^66207071 is an apocalyptic number.

66207071 is a deficient number, since it is larger than the sum of its proper divisors (9458161).

66207071 is an equidigital number, since it uses as much as digits as its factorization.

66207071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458160.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 66207071 is about 8136.7727632029. The cubic root of 66207071 is about 404.5461990185.

The spelling of 66207071 in words is "sixty-six million, two hundred seven thousand, seventy-one".