66434121 has 16 divisors (see below), whose sum is σ = 105992320. Its totient is φ = 40882320.

The previous prime is 66434107. The next prime is 66434131. The reversal of 66434121 is 12143466.

66434121 is a `hidden beast` number, since 6 + 643 + 4 + 12 + 1 = 666.

It is not a de Polignac number, because 66434121 - 2⁷ = 66433993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66434131) 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, 94285 + ... + 94986.

It is an arithmetic number, because the mean of its divisors is an integer number (6624520).

Almost surely, 2^66434121 is an apocalyptic number.

It is an amenable number.

66434121 is a deficient number, since it is larger than the sum of its proper divisors (39558199).

66434121 is a wasteful number, since it uses less digits than its factorization.

66434121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189293 (or 189287 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 66434121 is about 8150.7129136046. The cubic root of 66434121 is about 405.0081205505.

Adding to 66434121 its reverse (12143466), we get a palindrome (78577587).

The spelling of 66434121 in words is "sixty-six million, four hundred thirty-four thousand, one hundred twenty-one".