66250407 has 4 divisors (see below), whose sum is σ = 88333880. Its totient is φ = 44166936.

The previous prime is 66250381. The next prime is 66250417. The reversal of 66250407 is 70405266.

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

It is not a de Polignac number, because 66250407 - 2⁷ = 66250279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66250417) 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, 11041732 + ... + 11041737.

It is an arithmetic number, because the mean of its divisors is an integer number (22083470).

Almost surely, 2^66250407 is an apocalyptic number.

66250407 is a deficient number, since it is larger than the sum of its proper divisors (22083473).

66250407 is a wasteful number, since it uses less digits than its factorization.

66250407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22083472.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 66250407 is about 8139.4352998227. The cubic root of 66250407 is about 404.6344453348.

The spelling of 66250407 in words is "sixty-six million, two hundred fifty thousand, four hundred seven".