66572566 has 4 divisors (see below), whose sum is σ = 99858852. Its totient is φ = 33286282.

The previous prime is 66572551. The next prime is 66572567. The reversal of 66572566 is 66527566.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66572567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16643140 + ... + 16643143.

It is an arithmetic number, because the mean of its divisors is an integer number (24964713).

Almost surely, 2^66572566 is an apocalyptic number.

66572566 is a deficient number, since it is larger than the sum of its proper divisors (33286286).

66572566 is a wasteful number, since it uses less digits than its factorization.

66572566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33286285.

The product of its digits is 453600, while the sum is 43.

The square root of 66572566 is about 8159.2013089518. The cubic root of 66572566 is about 405.2892634511.

The spelling of 66572566 in words is "sixty-six million, five hundred seventy-two thousand, five hundred sixty-six".