66432271 has 4 divisors (see below), whose sum is σ = 66453472. Its totient is φ = 66411072.

The previous prime is 66432251. The next prime is 66432307. The reversal of 66432271 is 17223466.

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 66432271 - 2¹⁷ = 66301199 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66432221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4866 + ... + 12511.

It is an arithmetic number, because the mean of its divisors is an integer number (16613368).

Almost surely, 2^66432271 is an apocalyptic number.

66432271 is a deficient number, since it is larger than the sum of its proper divisors (21201).

66432271 is a wasteful number, since it uses less digits than its factorization.

66432271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21200.

The product of its digits is 12096, while the sum is 31.

The square root of 66432271 is about 8150.5994258091. The cubic root of 66432271 is about 405.0043610769.

The spelling of 66432271 in words is "sixty-six million, four hundred thirty-two thousand, two hundred seventy-one".