66188245 has 4 divisors (see below), whose sum is σ = 79425900. Its totient is φ = 52950592.

The previous prime is 66188219. The next prime is 66188263. The reversal of 66188245 is 54288166.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49688401 + 16499844 = 7049^2 + 4062^2 .

It is a cyclic number.

It is not a de Polignac number, because 66188245 - 2⁹ = 66187733 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 66188198 and 66188207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6618820 + ... + 6618829.

It is an arithmetic number, because the mean of its divisors is an integer number (19856475).

Almost surely, 2^66188245 is an apocalyptic number.

It is an amenable number.

66188245 is a deficient number, since it is larger than the sum of its proper divisors (13237655).

66188245 is a wasteful number, since it uses less digits than its factorization.

66188245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13237654.

The product of its digits is 92160, while the sum is 40.

The square root of 66188245 is about 8135.6158340964. The cubic root of 66188245 is about 404.5078511069.

The spelling of 66188245 in words is "sixty-six million, one hundred eighty-eight thousand, two hundred forty-five".