66250643 has 4 divisors (see below), whose sum is σ = 66451128. Its totient is φ = 66050160.

The previous prime is 66250619. The next prime is 66250661. The reversal of 66250643 is 34605266.

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

It is a cyclic number.

It is not a de Polignac number, because 66250643 - 2⁶ = 66250579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66250673) 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 3 ways as a sum of consecutive naturals, for example, 99746 + ... + 100407.

It is an arithmetic number, because the mean of its divisors is an integer number (16612782).

Almost surely, 2^66250643 is an apocalyptic number.

66250643 is a deficient number, since it is larger than the sum of its proper divisors (200485).

66250643 is a wasteful number, since it uses less digits than its factorization.

66250643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200484.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66250643 is about 8139.4497971300. The cubic root of 66250643 is about 404.6349258029.

The spelling of 66250643 in words is "sixty-six million, two hundred fifty thousand, six hundred forty-three".