66520624343 has 4 divisors (see below), whose sum is σ = 67179244488. Its totient is φ = 65862004200.

The previous prime is 66520624319. The next prime is 66520624349. The reversal of 66520624343 is 34342602566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34342602566 = 2 ⋅17171301283.

It is a cyclic number.

It is not a de Polignac number, because 66520624343 - 2⁸ = 66520624087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66520624343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520624349) 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, 329309921 + ... + 329310122.

It is an arithmetic number, because the mean of its divisors is an integer number (16794811122).

Almost surely, 2^66520624343 is an apocalyptic number.

66520624343 is a deficient number, since it is larger than the sum of its proper divisors (658620145).

66520624343 is a wasteful number, since it uses less digits than its factorization.

66520624343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658620144.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 66520624343 in words is "sixty-six billion, five hundred twenty million, six hundred twenty-four thousand, three hundred forty-three".