666630731111 has 2 divisors, whose sum is σ = 666630731112. Its totient is φ = 666630731110.

The previous prime is 666630731099. The next prime is 666630731141. The reversal of 666630731111 is 111137036666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666630731111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666630731141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333315365555 + 333315365556.

It is an arithmetic number, because the mean of its divisors is an integer number (333315365556).

Almost surely, 2^666630731111 is an apocalyptic number.

666630731111 is a deficient number, since it is larger than the sum of its proper divisors (1).

666630731111 is an equidigital number, since it uses as much as digits as its factorization.

666630731111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

Adding to 666630731111 its reverse (111137036666), we get a palindrome (777767767777).

The spelling of 666630731111 in words is "six hundred sixty-six billion, six hundred thirty million, seven hundred thirty-one thousand, one hundred eleven".