6667018987 has 2 divisors, whose sum is σ = 6667018988. Its totient is φ = 6667018986.

The previous prime is 6667018931. The next prime is 6667018997. The reversal of 6667018987 is 7898107666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6667018987 is a prime.

It is not a weakly prime, because it can be changed into another prime (6667018997) 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, 3333509493 + 3333509494.

It is an arithmetic number, because the mean of its divisors is an integer number (3333509494).

Almost surely, 2^6667018987 is an apocalyptic number.

6667018987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667018987 is an equidigital number, since it uses as much as digits as its factorization.

6667018987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 6667018987 is about 81651.8155768750. The cubic root of 6667018987 is about 1882.1052117908.

The spelling of 6667018987 in words is "six billion, six hundred sixty-seven million, eighteen thousand, nine hundred eighty-seven".