980665691 has 2 divisors, whose sum is σ = 980665692. Its totient is φ = 980665690.

The previous prime is 980665681. The next prime is 980665717. The reversal of 980665691 is 196566089.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 980665691 - 2⁶ = 980665627 is a prime.

It is a super-3 number, since 3×980665691³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (980665681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490332845 + 490332846.

It is an arithmetic number, because the mean of its divisors is an integer number (490332846).

Almost surely, 2^980665691 is an apocalyptic number.

980665691 is a deficient number, since it is larger than the sum of its proper divisors (1).

980665691 is an equidigital number, since it uses as much as digits as its factorization.

980665691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 980665691 is about 31315.5822395178. The cubic root of 980665691 is about 993.5132433042.

The spelling of 980665691 in words is "nine hundred eighty million, six hundred sixty-five thousand, six hundred ninety-one".