666731401139 has 2 divisors, whose sum is σ = 666731401140. Its totient is φ = 666731401138.

The previous prime is 666731401129. The next prime is 666731401177. The reversal of 666731401139 is 931104137666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666731401139 is a prime.

It is a super-2 number, since 2×666731401139² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666731401093 and 666731401102.

It is not a weakly prime, because it can be changed into another prime (666731401129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333365700569 + 333365700570.

It is an arithmetic number, because the mean of its divisors is an integer number (333365700570).

Almost surely, 2^666731401139 is an apocalyptic number.

666731401139 is a deficient number, since it is larger than the sum of its proper divisors (1).

666731401139 is an equidigital number, since it uses as much as digits as its factorization.

666731401139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 666731401139 in words is "six hundred sixty-six billion, seven hundred thirty-one million, four hundred one thousand, one hundred thirty-nine".