66803182421 has 2 divisors, whose sum is σ = 66803182422. Its totient is φ = 66803182420.

The previous prime is 66803182417. The next prime is 66803182441. The reversal of 66803182421 is 12428130866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51944791396 + 14858391025 = 227914^2 + 121895^2 .

It is a cyclic number.

It is not a de Polignac number, because 66803182421 - 2² = 66803182417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66803182441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33401591210 + 33401591211.

It is an arithmetic number, because the mean of its divisors is an integer number (33401591211).

Almost surely, 2^66803182421 is an apocalyptic number.

It is an amenable number.

66803182421 is a deficient number, since it is larger than the sum of its proper divisors (1).

66803182421 is an equidigital number, since it uses as much as digits as its factorization.

66803182421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 66803182421 in words is "sixty-six billion, eight hundred three million, one hundred eighty-two thousand, four hundred twenty-one".