66245005 has 8 divisors (see below), whose sum is σ = 84170232. Its totient is φ = 49878528.

The previous prime is 66244999. The next prime is 66245009. The reversal of 66245005 is 50054266.

It can be written as a sum of positive squares in 4 ways, for example, as 4748041 + 61496964 = 2179^2 + 7842^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66245005 - 2⁵ = 66244973 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 (66245009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389592 + ... + 389761.

It is an arithmetic number, because the mean of its divisors is an integer number (10521279).

Almost surely, 2^66245005 is an apocalyptic number.

It is an amenable number.

66245005 is a deficient number, since it is larger than the sum of its proper divisors (17925227).

66245005 is a wasteful number, since it uses less digits than its factorization.

66245005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779375.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 66245005 is about 8139.1034518551. The cubic root of 66245005 is about 404.6234471901.

The spelling of 66245005 in words is "sixty-six million, two hundred forty-five thousand, five".