66143471 has 2 divisors, whose sum is σ = 66143472. Its totient is φ = 66143470.

The previous prime is 66143453. The next prime is 66143479. The reversal of 66143471 is 17434166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66143471 is a prime.

It is a super-3 number, since 3×66143471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66143479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33071735 + 33071736.

It is an arithmetic number, because the mean of its divisors is an integer number (33071736).

Almost surely, 2^66143471 is an apocalyptic number.

66143471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66143471 is an equidigital number, since it uses as much as digits as its factorization.

66143471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 66143471 is about 8132.8636408094. The cubic root of 66143471 is about 404.4166187943.

The spelling of 66143471 in words is "sixty-six million, one hundred forty-three thousand, four hundred seventy-one".