66572623643 has 4 divisors (see below), whose sum is σ = 70076445960. Its totient is φ = 63068801328.

The previous prime is 66572623639. The next prime is 66572623661. The reversal of 66572623643 is 34632627566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66572623643 - 2² = 66572623639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66572623591 and 66572623600.

It is not an unprimeable number, because it can be changed into a prime (66572623633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751911130 + ... + 1751911167.

It is an arithmetic number, because the mean of its divisors is an integer number (17519111490).

Almost surely, 2^66572623643 is an apocalyptic number.

66572623643 is a deficient number, since it is larger than the sum of its proper divisors (3503822317).

66572623643 is a wasteful number, since it uses less digits than its factorization.

66572623643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503822316.

The product of its digits is 6531840, while the sum is 50.

The spelling of 66572623643 in words is "sixty-six billion, five hundred seventy-two million, six hundred twenty-three thousand, six hundred forty-three".