66266245 has 4 divisors (see below), whose sum is σ = 79519500. Its totient is φ = 53012992.

The previous prime is 66266237. The next prime is 66266279. The reversal of 66266245 is 54266266.

It is a happy number.

66266245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54266266 = 2 ⋅27133133.

It can be written as a sum of positive squares in 2 ways, for example, as 16394401 + 49871844 = 4049^2 + 7062^2 .

It is a cyclic number.

It is not a de Polignac number, because 66266245 - 2³ = 66266237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6626620 + ... + 6626629.

It is an arithmetic number, because the mean of its divisors is an integer number (19879875).

Almost surely, 2^66266245 is an apocalyptic number.

It is an amenable number.

66266245 is a deficient number, since it is larger than the sum of its proper divisors (13253255).

66266245 is a wasteful number, since it uses less digits than its factorization.

66266245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13253254.

The product of its digits is 103680, while the sum is 37.

The square root of 66266245 is about 8140.4081593001. The cubic root of 66266245 is about 404.6666870977. Note that the first 4 decimals are identical.

The spelling of 66266245 in words is "sixty-six million, two hundred sixty-six thousand, two hundred forty-five".