66492121 has 2 divisors, whose sum is σ = 66492122. Its totient is φ = 66492120.

The previous prime is 66492089. The next prime is 66492131. The reversal of 66492121 is 12129466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 11806096 = 7395^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 66492121 - 2⁵ = 66492089 is a prime.

It is not a weakly prime, because it can be changed into another prime (66492131) 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 as a sum of consecutive naturals, namely, 33246060 + 33246061.

It is an arithmetic number, because the mean of its divisors is an integer number (33246061).

Almost surely, 2^66492121 is an apocalyptic number.

It is an amenable number.

66492121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66492121 is an equidigital number, since it uses as much as digits as its factorization.

66492121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 66492121 is about 8154.2701083543. The cubic root of 66492121 is about 405.1259497517.

The spelling of 66492121 in words is "sixty-six million, four hundred ninety-two thousand, one hundred twenty-one".