666766703 has 2 divisors, whose sum is σ = 666766704. Its totient is φ = 666766702.

The previous prime is 666766699. The next prime is 666766717. The reversal of 666766703 is 307667666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666766703 - 2² = 666766699 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666766733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333383351 + 333383352.

It is an arithmetic number, because the mean of its divisors is an integer number (333383352).

Almost surely, 2^666766703 is an apocalyptic number.

666766703 is a deficient number, since it is larger than the sum of its proper divisors (1).

666766703 is an equidigital number, since it uses as much as digits as its factorization.

666766703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 47.

The square root of 666766703 is about 25821.8260973154. The cubic root of 666766703 is about 873.6241574442.

The spelling of 666766703 in words is "six hundred sixty-six million, seven hundred sixty-six thousand, seven hundred three".