66572623727 has 4 divisors (see below), whose sum is σ = 66711606720. Its totient is φ = 66433640736.

The previous prime is 66572623709. The next prime is 66572623739. The reversal of 66572623727 is 72732627566.

It is a happy number.

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 66572623727 - 2²⁶ = 66505514863 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 (66572623787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69490778 + ... + 69491735.

It is an arithmetic number, because the mean of its divisors is an integer number (16677901680).

Almost surely, 2^66572623727 is an apocalyptic number.

66572623727 is a deficient number, since it is larger than the sum of its proper divisors (138982993).

66572623727 is a wasteful number, since it uses less digits than its factorization.

66572623727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138982992.

The product of its digits is 8890560, while the sum is 53.

The spelling of 66572623727 in words is "sixty-six billion, five hundred seventy-two million, six hundred twenty-three thousand, seven hundred twenty-seven".