66242745 has 32 divisors (see below), whose sum is σ = 118112640. Its totient is φ = 35225280.

The previous prime is 66242741. The next prime is 66242773. The reversal of 66242745 is 54724266.

66242745 is a `hidden beast` number, since 6 + 624 + 27 + 4 + 5 = 666.

It is not a de Polignac number, because 66242745 - 2² = 66242741 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66242741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72582 + ... + 73488.

It is an arithmetic number, because the mean of its divisors is an integer number (3691020).

Almost surely, 2^66242745 is an apocalyptic number.

It is an amenable number.

66242745 is a deficient number, since it is larger than the sum of its proper divisors (51869895).

66242745 is a wasteful number, since it uses less digits than its factorization.

66242745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462 (or 1456 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 66242745 is about 8138.9646147406. The cubic root of 66242745 is about 404.6188457897.

The spelling of 66242745 in words is "sixty-six million, two hundred forty-two thousand, seven hundred forty-five".