66572647327 has 4 divisors (see below), whose sum is σ = 66573168376. Its totient is φ = 66572126280.

The previous prime is 66572647303. The next prime is 66572647331. The reversal of 66572647327 is 72374627566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 72374627566 = 2 ⋅36187313783.

It is a cyclic number.

It is not a de Polignac number, because 66572647327 - 2¹⁹ = 66572123039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66572647027) 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, 76177 + ... + 372757.

It is an arithmetic number, because the mean of its divisors is an integer number (16643292094).

Almost surely, 2^66572647327 is an apocalyptic number.

66572647327 is a deficient number, since it is larger than the sum of its proper divisors (521049).

66572647327 is a wasteful number, since it uses less digits than its factorization.

66572647327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521048.

The product of its digits is 17781120, while the sum is 55.

The spelling of 66572647327 in words is "sixty-six billion, five hundred seventy-two million, six hundred forty-seven thousand, three hundred twenty-seven".