66471983 has 4 divisors (see below), whose sum is σ = 66536400. Its totient is φ = 66407568.

The previous prime is 66471971. The next prime is 66472009. The reversal of 66471983 is 38917466.

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 66471983 - 2¹⁸ = 66209839 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 (66471913) 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, 30635 + ... + 32732.

It is an arithmetic number, because the mean of its divisors is an integer number (16634100).

Almost surely, 2^66471983 is an apocalyptic number.

66471983 is a deficient number, since it is larger than the sum of its proper divisors (64417).

66471983 is a wasteful number, since it uses less digits than its factorization.

66471983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64416.

The product of its digits is 217728, while the sum is 44.

The square root of 66471983 is about 8153.0352016902. The cubic root of 66471983 is about 405.0850464084.

The spelling of 66471983 in words is "sixty-six million, four hundred seventy-one thousand, nine hundred eighty-three".