66094421 has 2 divisors, whose sum is σ = 66094422. Its totient is φ = 66094420.

The previous prime is 66094403. The next prime is 66094429. The reversal of 66094421 is 12449066.

It is a happy number.

66094421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 4157521 = 7870^2 + 2039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66094421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66094429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33047210 + 33047211.

It is an arithmetic number, because the mean of its divisors is an integer number (33047211).

Almost surely, 2^66094421 is an apocalyptic number.

It is an amenable number.

66094421 is a deficient number, since it is larger than the sum of its proper divisors (1).

66094421 is an equidigital number, since it uses as much as digits as its factorization.

66094421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66094421 is about 8129.8475385458. The cubic root of 66094421 is about 404.3166263572.

The spelling of 66094421 in words is "sixty-six million, ninety-four thousand, four hundred twenty-one".