66825121 has 8 divisors (see below), whose sum is σ = 74678688. Its totient is φ = 59268000.

The previous prime is 66825107. The next prime is 66825127. The reversal of 66825121 is 12152866.

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

It is not a de Polignac number, because 66825121 - 2¹³ = 66816929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66825127) 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, 73635 + ... + 74536.

It is an arithmetic number, because the mean of its divisors is an integer number (9334836).

Almost surely, 2^66825121 is an apocalyptic number.

It is an amenable number.

66825121 is a deficient number, since it is larger than the sum of its proper divisors (7853567).

66825121 is a wasteful number, since it uses less digits than its factorization.

66825121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148223.

The product of its digits is 5760, while the sum is 31.

The square root of 66825121 is about 8174.6633569830. The cubic root of 66825121 is about 405.8011292770.

Adding to 66825121 its reverse (12152866), we get a palindrome (78977987).

The spelling of 66825121 in words is "sixty-six million, eight hundred twenty-five thousand, one hundred twenty-one".