66213245 has 8 divisors (see below), whose sum is σ = 90806784. Its totient is φ = 45403344.

The previous prime is 66213211. The next prime is 66213247. The reversal of 66213245 is 54231266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66213245 - 2¹⁸ = 65951101 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 (66213247) 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 7 ways as a sum of consecutive naturals, for example, 945869 + ... + 945938.

It is an arithmetic number, because the mean of its divisors is an integer number (11350848).

Almost surely, 2^66213245 is an apocalyptic number.

It is an amenable number.

66213245 is a deficient number, since it is larger than the sum of its proper divisors (24593539).

66213245 is a wasteful number, since it uses less digits than its factorization.

66213245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891819.

The product of its digits is 8640, while the sum is 29.

The square root of 66213245 is about 8137.1521431026. The cubic root of 66213245 is about 404.5587736603.

The spelling of 66213245 in words is "sixty-six million, two hundred thirteen thousand, two hundred forty-five".