7066278421 has 2 divisors, whose sum is σ = 7066278422. Its totient is φ = 7066278420.

The previous prime is 7066278367. The next prime is 7066278433. The reversal of 7066278421 is 1248726607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7062553521 + 3724900 = 84039^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 7066278421 - 2¹³ = 7066270229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7066276421) 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, 3533139210 + 3533139211.

It is an arithmetic number, because the mean of its divisors is an integer number (3533139211).

Almost surely, 2^7066278421 is an apocalyptic number.

It is an amenable number.

7066278421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7066278421 is an equidigital number, since it uses as much as digits as its factorization.

7066278421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 7066278421 is about 84061.1588130927. The cubic root of 7066278421 is about 1918.9496588932.

The spelling of 7066278421 in words is "seven billion, sixty-six million, two hundred seventy-eight thousand, four hundred twenty-one".