666716683 has 2 divisors, whose sum is σ = 666716684. Its totient is φ = 666716682.

The previous prime is 666716651. The next prime is 666716689. The reversal of 666716683 is 386617666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666716683 - 2⁵ = 666716651 is a prime.

It is a super-2 number, since 2×666716683² = 889022270781044978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666716689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333358341 + 333358342.

It is an arithmetic number, because the mean of its divisors is an integer number (333358342).

Almost surely, 2^666716683 is an apocalyptic number.

666716683 is a deficient number, since it is larger than the sum of its proper divisors (1).

666716683 is an equidigital number, since it uses as much as digits as its factorization.

666716683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 666716683 is about 25820.8575186805. The cubic root of 666716683 is about 873.6023108358.

The spelling of 666716683 in words is "six hundred sixty-six million, seven hundred sixteen thousand, six hundred eighty-three".