66591143 has 6 divisors (see below), whose sum is σ = 70280784. Its totient is φ = 63086004.

The previous prime is 66591137. The next prime is 66591197. The reversal of 66591143 is 34119566.

It is a de Polignac number, because none of the positive numbers 2^k-66591143 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 (66591103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91871 + ... + 92592.

It is an arithmetic number, because the mean of its divisors is an integer number (11713464).

Almost surely, 2^66591143 is an apocalyptic number.

66591143 is a deficient number, since it is larger than the sum of its proper divisors (3689641).

66591143 is a wasteful number, since it uses less digits than its factorization.

66591143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184501 (or 184482 counting only the distinct ones).

The product of its digits is 19440, while the sum is 35.

The square root of 66591143 is about 8160.3396375396. The cubic root of 66591143 is about 405.3269584501.

The spelling of 66591143 in words is "sixty-six million, five hundred ninety-one thousand, one hundred forty-three".