66104121 has 16 divisors (see below), whose sum is σ = 91209728. Its totient is φ = 42541200.

The previous prime is 66104117. The next prime is 66104153. The reversal of 66104121 is 12140166.

It is not a de Polignac number, because 66104121 - 2² = 66104117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66104221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55866 + ... + 57036.

It is an arithmetic number, because the mean of its divisors is an integer number (5700608).

Almost surely, 2^66104121 is an apocalyptic number.

It is an amenable number.

66104121 is a deficient number, since it is larger than the sum of its proper divisors (25105607).

66104121 is a wasteful number, since it uses less digits than its factorization.

66104121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 66104121 is about 8130.4440838124. Note that the first 3 decimals coincide. The cubic root of 66104121 is about 404.3364045239.

Adding to 66104121 its reverse (12140166), we get a palindrome (78244287).

It can be divided in two parts, 6610 and 4121, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 66104121 in words is "sixty-six million, one hundred four thousand, one hundred twenty-one".