66648825 has 96 divisors (see below), whose sum is σ = 131777280. Its totient is φ = 33359040.

The previous prime is 66648817. The next prime is 66648851. The reversal of 66648825 is 52884666.

It is not a de Polignac number, because 66648825 - 2³ = 66648817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 1257499 + ... + 1257551.

It is an arithmetic number, because the mean of its divisors is an integer number (1372680).

Almost surely, 2^66648825 is an apocalyptic number.

It is an amenable number.

66648825 is a deficient number, since it is larger than the sum of its proper divisors (65128455).

66648825 is an equidigital number, since it uses as much as digits as its factorization.

66648825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 84 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 66648825 is about 8163.8731616801. The cubic root of 66648825 is about 405.4439576040.

The spelling of 66648825 in words is "sixty-six million, six hundred forty-eight thousand, eight hundred twenty-five".