66343543471 has 4 divisors (see below), whose sum is σ = 66420958032. Its totient is φ = 66266128912.

The previous prime is 66343543439. The next prime is 66343543499. The reversal of 66343543471 is 17434534366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17434534366 = 2 ⋅8717267183.

It is a cyclic number.

It is not a de Polignac number, because 66343543471 - 2⁵ = 66343543439 is a prime.

It is a super-3 number, since 3×66343543471³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66343543411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38705995 + ... + 38707708.

It is an arithmetic number, because the mean of its divisors is an integer number (16605239508).

Almost surely, 2^66343543471 is an apocalyptic number.

66343543471 is a deficient number, since it is larger than the sum of its proper divisors (77414561).

66343543471 is an equidigital number, since it uses as much as digits as its factorization.

66343543471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77414560.

The product of its digits is 2177280, while the sum is 46.

The spelling of 66343543471 in words is "sixty-six billion, three hundred forty-three million, five hundred forty-three thousand, four hundred seventy-one".