66825825 has 24 divisors (see below), whose sum is σ = 120530976. Its totient is φ = 32400000.

The previous prime is 66825821. The next prime is 66825877. The reversal of 66825825 is 52852866.

It is not a de Polignac number, because 66825825 - 2² = 66825821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66825821) 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 23 ways as a sum of consecutive naturals, for example, 39676 + ... + 41325.

It is an arithmetic number, because the mean of its divisors is an integer number (5022124).

Almost surely, 2^66825825 is an apocalyptic number.

It is an amenable number.

66825825 is a deficient number, since it is larger than the sum of its proper divisors (53705151).

66825825 is a wasteful number, since it uses less digits than its factorization.

66825825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81025 (or 81020 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 66825825 is about 8174.7064167467. The cubic root of 66825825 is about 405.8025543049.

It can be divided in two parts, 66825 and 825, that multiplied together give a square (55130625 = 7425²).

The spelling of 66825825 in words is "sixty-six million, eight hundred twenty-five thousand, eight hundred twenty-five".