66746725 has 12 divisors (see below), whose sum is σ = 83119680. Its totient is φ = 53169200.

The previous prime is 66746723. The next prime is 66746731. The reversal of 66746725 is 52764766.

It is not a de Polignac number, because 66746725 - 2¹ = 66746723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66746723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390 + ... + 11560.

It is an arithmetic number, because the mean of its divisors is an integer number (6926640).

Almost surely, 2^66746725 is an apocalyptic number.

It is an amenable number.

66746725 is a deficient number, since it is larger than the sum of its proper divisors (16372955).

66746725 is a wasteful number, since it uses less digits than its factorization.

66746725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11420 (or 11415 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The square root of 66746725 is about 8169.8668899805. The cubic root of 66746725 is about 405.6423784283.

The spelling of 66746725 in words is "sixty-six million, seven hundred forty-six thousand, seven hundred twenty-five".