66676700670421 has 2 divisors, whose sum is σ = 66676700670422. Its totient is φ = 66676700670420.

The previous prime is 66676700670373. The next prime is 66676700670449. The reversal of 66676700670421 is 12407600767666.

66676700670421 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., 61007206325521 + 5669494344900 = 7810711^2 + 2381070^2 .

It is a cyclic number.

It is not a de Polignac number, because 66676700670421 - 2³⁵ = 66642340932053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66676700670451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33338350335210 + 33338350335211.

It is an arithmetic number, because the mean of its divisors is an integer number (33338350335211).

Almost surely, 2^{66676700670421} is an apocalyptic number.

It is an amenable number.

66676700670421 is a deficient number, since it is larger than the sum of its proper divisors (1).

66676700670421 is an equidigital number, since it uses as much as digits as its factorization.

66676700670421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 58.

The spelling of 66676700670421 in words is "sixty-six trillion, six hundred seventy-six billion, seven hundred million, six hundred seventy thousand, four hundred twenty-one".