66607271 has 4 divisors (see below), whose sum is σ = 67086600. Its totient is φ = 66127944.

The previous prime is 66607267. The next prime is 66607337. The reversal of 66607271 is 17270666.

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 66607271 - 2² = 66607267 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 (66607771) 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, 239456 + ... + 239733.

It is an arithmetic number, because the mean of its divisors is an integer number (16771650).

Almost surely, 2^66607271 is an apocalyptic number.

66607271 is a deficient number, since it is larger than the sum of its proper divisors (479329).

66607271 is a wasteful number, since it uses less digits than its factorization.

66607271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479328.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 66607271 is about 8161.3277718763. The cubic root of 66607271 is about 405.3596784446.

It can be divided in two parts, 6660 and 7271, that added together give a palindrome (13931).

The spelling of 66607271 in words is "sixty-six million, six hundred seven thousand, two hundred seventy-one".