66572373571 has 4 divisors (see below), whose sum is σ = 72624407544. Its totient is φ = 60520339600.

The previous prime is 66572373563. The next prime is 66572373587. The reversal of 66572373571 is 17537327566.

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 66572373571 - 2³ = 66572373563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66572373271) 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, 3026016970 + ... + 3026016991.

It is an arithmetic number, because the mean of its divisors is an integer number (18156101886).

Almost surely, 2^66572373571 is an apocalyptic number.

66572373571 is a deficient number, since it is larger than the sum of its proper divisors (6052033973).

66572373571 is a wasteful number, since it uses less digits than its factorization.

66572373571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6052033972.

The product of its digits is 5556600, while the sum is 52.

The spelling of 66572373571 in words is "sixty-six billion, five hundred seventy-two million, three hundred seventy-three thousand, five hundred seventy-one".