66533271523 has 4 divisors (see below), whose sum is σ = 67334877288. Its totient is φ = 65731665760.

The previous prime is 66533271521. The next prime is 66533271529. The reversal of 66533271523 is 32517233566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32517233566 = 2 ⋅16258616783.

It is a cyclic number.

It is not a de Polignac number, because 66533271523 - 2¹ = 66533271521 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 66533271523.

It is not an unprimeable number, because it can be changed into a prime (66533271521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400802758 + ... + 400802923.

It is an arithmetic number, because the mean of its divisors is an integer number (16833719322).

Almost surely, 2^66533271523 is an apocalyptic number.

66533271523 is a deficient number, since it is larger than the sum of its proper divisors (801605765).

66533271523 is an equidigital number, since it uses as much as digits as its factorization.

66533271523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801605764.

The product of its digits is 680400, while the sum is 43.

The spelling of 66533271523 in words is "sixty-six billion, five hundred thirty-three million, two hundred seventy-one thousand, five hundred twenty-three".