66541121 has 4 divisors (see below), whose sum is σ = 67151700. Its totient is φ = 65930544.

The previous prime is 66541103. The next prime is 66541141. The reversal of 66541121 is 12114566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28890625 + 37650496 = 5375^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 66541121 - 2¹⁴ = 66524737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66541141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305126 + ... + 305343.

It is an arithmetic number, because the mean of its divisors is an integer number (16787925).

Almost surely, 2^66541121 is an apocalyptic number.

It is an amenable number.

66541121 is a deficient number, since it is larger than the sum of its proper divisors (610579).

66541121 is a wasteful number, since it uses less digits than its factorization.

66541121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610578.

The product of its digits is 1440, while the sum is 26.

The square root of 66541121 is about 8157.2741157816. The cubic root of 66541121 is about 405.2254417262.

Adding to 66541121 its reverse (12114566), we get a palindrome (78655687).

The spelling of 66541121 in words is "sixty-six million, five hundred forty-one thousand, one hundred twenty-one".