66242564 has 6 divisors (see below), whose sum is σ = 115924494. Its totient is φ = 33121280.

The previous prime is 66242563. The next prime is 66242597. The reversal of 66242564 is 46524266.

It can be written as a sum of positive squares in only one way, i.e., 61748164 + 4494400 = 7858^2 + 2120^2 .

It is not an unprimeable number, because it can be changed into a prime (66242563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280317 + ... + 8280324.

It is an arithmetic number, because the mean of its divisors is an integer number (19320749).

Almost surely, 2^66242564 is an apocalyptic number.

It is an amenable number.

66242564 is a deficient number, since it is larger than the sum of its proper divisors (49681930).

66242564 is a wasteful number, since it uses less digits than its factorization.

66242564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16560645 (or 16560643 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 66242564 is about 8138.9534953826. The cubic root of 66242564 is about 404.6184772659.

The spelling of 66242564 in words is "sixty-six million, two hundred forty-two thousand, five hundred sixty-four".