666700406651 has 2 divisors, whose sum is σ = 666700406652. Its totient is φ = 666700406650.

The previous prime is 666700406639. The next prime is 666700406657. The reversal of 666700406651 is 156604007666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666700406651 - 2¹⁴ = 666700390267 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666700406596 and 666700406605.

It is not a weakly prime, because it can be changed into another prime (666700406657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333350203325 + 333350203326.

It is an arithmetic number, because the mean of its divisors is an integer number (333350203326).

Almost surely, 2^666700406651 is an apocalyptic number.

666700406651 is a deficient number, since it is larger than the sum of its proper divisors (1).

666700406651 is an equidigital number, since it uses as much as digits as its factorization.

666700406651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 666700406651 in words is "six hundred sixty-six billion, seven hundred million, four hundred six thousand, six hundred fifty-one".