6666402137 has 2 divisors, whose sum is σ = 6666402138. Its totient is φ = 6666402136.

The previous prime is 6666402109. The next prime is 6666402143. The reversal of 6666402137 is 7312046666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5736396121 + 930006016 = 75739^2 + 30496^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666402137 - 2⁸ = 6666401881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6666402094 and 6666402103.

It is not a weakly prime, because it can be changed into another prime (6666402157) 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, 3333201068 + 3333201069.

It is an arithmetic number, because the mean of its divisors is an integer number (3333201069).

Almost surely, 2^6666402137 is an apocalyptic number.

It is an amenable number.

6666402137 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666402137 is an equidigital number, since it uses as much as digits as its factorization.

6666402137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 6666402137 is about 81648.0381699401. The cubic root of 6666402137 is about 1882.0471642381.

The spelling of 6666402137 in words is "six billion, six hundred sixty-six million, four hundred two thousand, one hundred thirty-seven".