6666402427 has 2 divisors, whose sum is σ = 6666402428. Its totient is φ = 6666402426.

The previous prime is 6666402349. The next prime is 6666402437. The reversal of 6666402427 is 7242046666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666402427 - 2¹¹ = 6666400379 is a prime.

It is a super-2 number, since 2×6666402427² = 88881842637422980658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6666402437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333201213 + 3333201214.

It is an arithmetic number, because the mean of its divisors is an integer number (3333201214).

Almost surely, 2^6666402427 is an apocalyptic number.

6666402427 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666402427 is an equidigital number, since it uses as much as digits as its factorization.

6666402427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 43.

The square root of 6666402427 is about 81648.0399458554. The cubic root of 6666402427 is about 1882.0471915289.

The spelling of 6666402427 in words is "six billion, six hundred sixty-six million, four hundred two thousand, four hundred twenty-seven".