66486421 has 2 divisors, whose sum is σ = 66486422. Its totient is φ = 66486420.

The previous prime is 66486391. The next prime is 66486437. The reversal of 66486421 is 12468466.

66486421 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., 50566321 + 15920100 = 7111^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 66486421 - 2⁵ = 66486389 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 (66486481) 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, 33243210 + 33243211.

It is an arithmetic number, because the mean of its divisors is an integer number (33243211).

Almost surely, 2^66486421 is an apocalyptic number.

It is an amenable number.

66486421 is a deficient number, since it is larger than the sum of its proper divisors (1).

66486421 is an equidigital number, since it uses as much as digits as its factorization.

66486421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 37.

The square root of 66486421 is about 8153.9205907343. The cubic root of 66486421 is about 405.1143730221.

The spelling of 66486421 in words is "sixty-six million, four hundred eighty-six thousand, four hundred twenty-one".