66572556 has 12 divisors (see below), whose sum is σ = 155335992. Its totient is φ = 22190848.

The previous prime is 66572551. The next prime is 66572567. The reversal of 66572556 is 65527566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (66572551) 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, 2773845 + ... + 2773868.

It is an arithmetic number, because the mean of its divisors is an integer number (12944666).

Almost surely, 2^66572556 is an apocalyptic number.

It is an amenable number.

66572556 is an abundant number, since it is smaller than the sum of its proper divisors (88763436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66572556 is a wasteful number, since it uses less digits than its factorization.

66572556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5547720 (or 5547718 counting only the distinct ones).

The product of its digits is 378000, while the sum is 42.

The square root of 66572556 is about 8159.2006961467. The cubic root of 66572556 is about 405.2892431580.

The spelling of 66572556 in words is "sixty-six million, five hundred seventy-two thousand, five hundred fifty-six".