666006701693 has 2 divisors, whose sum is σ = 666006701694. Its totient is φ = 666006701692.

The previous prime is 666006701683. The next prime is 666006701827. The reversal of 666006701693 is 396107600666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646284150724 + 19722550969 = 803918^2 + 140437^2 .

It is a cyclic number.

It is not a de Polignac number, because 666006701693 - 2¹⁰ = 666006700669 is a prime.

It is a super-3 number, since 3×666006701693³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666006701623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333003350846 + 333003350847.

It is an arithmetic number, because the mean of its divisors is an integer number (333003350847).

Almost surely, 2^666006701693 is an apocalyptic number.

It is an amenable number.

666006701693 is a deficient number, since it is larger than the sum of its proper divisors (1).

666006701693 is an equidigital number, since it uses as much as digits as its factorization.

666006701693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The spelling of 666006701693 in words is "six hundred sixty-six billion, six million, seven hundred one thousand, six hundred ninety-three".