66250111 has 4 divisors (see below), whose sum is σ = 67088800. Its totient is φ = 65411424.

The previous prime is 66250099. The next prime is 66250117. The reversal of 66250111 is 11105266.

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 66250111 - 2⁷ = 66249983 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 (66250117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419226 + ... + 419383.

It is an arithmetic number, because the mean of its divisors is an integer number (16772200).

Almost surely, 2^66250111 is an apocalyptic number.

66250111 is a deficient number, since it is larger than the sum of its proper divisors (838689).

66250111 is an equidigital number, since it uses as much as digits as its factorization.

66250111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838688.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 66250111 is about 8139.4171167228. The cubic root of 66250111 is about 404.6338427123.

Adding to 66250111 its reverse (11105266), we get a palindrome (77355377).

The spelling of 66250111 in words is "sixty-six million, two hundred fifty thousand, one hundred eleven".