66572427566 has 4 divisors (see below), whose sum is σ = 99858641352. Its totient is φ = 33286213782.

The previous prime is 66572427547. The next prime is 66572427569.

66572427566 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×66572427566² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66572427569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16643106890 + ... + 16643106893.

It is an arithmetic number, because the mean of its divisors is an integer number (24964660338).

Almost surely, 2^66572427566 is an apocalyptic number.

66572427566 is a deficient number, since it is larger than the sum of its proper divisors (33286213786).

66572427566 is a wasteful number, since it uses less digits than its factorization.

66572427566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33286213785.

The product of its digits is 25401600, while the sum is 56.

The spelling of 66572427566 in words is "sixty-six billion, five hundred seventy-two million, four hundred twenty-seven thousand, five hundred sixty-six".