66471121 has 2 divisors, whose sum is σ = 66471122. Its totient is φ = 66471120.

The previous prime is 66471109. The next prime is 66471133. The reversal of 66471121 is 12117466.

It is a balanced prime because it is at equal distance from previous prime (66471109) and next prime (66471133).

It can be written as a sum of positive squares in only one way, i.e., 47886400 + 18584721 = 6920^2 + 4311^2 .

It is a cyclic number.

It is not a de Polignac number, because 66471121 - 2¹⁷ = 66340049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66471121.

It is not a weakly prime, because it can be changed into another prime (66471191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33235560 + 33235561.

It is an arithmetic number, because the mean of its divisors is an integer number (33235561).

Almost surely, 2^66471121 is an apocalyptic number.

It is an amenable number.

66471121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66471121 is an equidigital number, since it uses as much as digits as its factorization.

66471121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 66471121 is about 8152.9823377706. The cubic root of 66471121 is about 405.0832953708.

Adding to 66471121 its reverse (12117466), we get a palindrome (78588587).

The spelling of 66471121 in words is "sixty-six million, four hundred seventy-one thousand, one hundred twenty-one".