66825539 has 8 divisors (see below), whose sum is σ = 73623600. Its totient is φ = 60148000.

The previous prime is 66825529. The next prime is 66825559. The reversal of 66825539 is 93552866.

It is a happy number.

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

It is not a de Polignac number, because 66825539 - 2⁴ = 66825523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66825539.

It is not an unprimeable number, because it can be changed into a prime (66825509) 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 7 ways as a sum of consecutive naturals, for example, 28964 + ... + 31185.

It is an arithmetic number, because the mean of its divisors is an integer number (9202950).

Almost surely, 2^66825539 is an apocalyptic number.

66825539 is a deficient number, since it is larger than the sum of its proper divisors (6798061).

66825539 is a wasteful number, since it uses less digits than its factorization.

66825539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60261.

The product of its digits is 388800, while the sum is 44.

The square root of 66825539 is about 8174.6889237450. The cubic root of 66825539 is about 405.8019753885.

It can be divided in two parts, 6682 and 5539, that added together give a palindrome (12221).

The spelling of 66825539 in words is "sixty-six million, eight hundred twenty-five thousand, five hundred thirty-nine".