66405143 has 8 divisors (see below), whose sum is σ = 77440800. Its totient is φ = 56918400.

The previous prime is 66405139. The next prime is 66405151. The reversal of 66405143 is 34150466.

It is a happy number.

It is not a de Polignac number, because 66405143 - 2² = 66405139 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 (66405943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96458 + ... + 97143.

It is an arithmetic number, because the mean of its divisors is an integer number (9680100).

Almost surely, 2^66405143 is an apocalyptic number.

66405143 is a deficient number, since it is larger than the sum of its proper divisors (11035657).

66405143 is an equidigital number, since it uses as much as digits as its factorization.

66405143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193622 (or 193608 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66405143 is about 8148.9350838008. The cubic root of 66405143 is about 404.9492249509.

The spelling of 66405143 in words is "sixty-six million, four hundred five thousand, one hundred forty-three".