66572613643 has 8 divisors (see below), whose sum is σ = 68893912800. Its totient is φ = 64253027328.

The previous prime is 66572613637. The next prime is 66572613659. The reversal of 66572613643 is 34631627566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66572613643 - 2²⁵ = 66539059211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66572613623) 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, 348871 + ... + 504832.

It is an arithmetic number, because the mean of its divisors is an integer number (8611739100).

Almost surely, 2^66572613643 is an apocalyptic number.

66572613643 is a deficient number, since it is larger than the sum of its proper divisors (2321299157).

66572613643 is a wasteful number, since it uses less digits than its factorization.

66572613643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856421.

The product of its digits is 3265920, while the sum is 49.

The spelling of 66572613643 in words is "sixty-six billion, five hundred seventy-two million, six hundred thirteen thousand, six hundred forty-three".