9995667691 has 2 divisors, whose sum is σ = 9995667692. Its totient is φ = 9995667690.

The previous prime is 9995667679. The next prime is 9995667719. The reversal of 9995667691 is 1967665999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9995667691 - 2¹⁷ = 9995536619 is a prime.

It is not a weakly prime, because it can be changed into another prime (9995667791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997833845 + 4997833846.

It is an arithmetic number, because the mean of its divisors is an integer number (4997833846).

Almost surely, 2^9995667691 is an apocalyptic number.

9995667691 is a deficient number, since it is larger than the sum of its proper divisors (1).

9995667691 is an equidigital number, since it uses as much as digits as its factorization.

9995667691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49601160, while the sum is 67.

The square root of 9995667691 is about 99978.3361083790. The cubic root of 9995667691 is about 2154.1235225318.

The spelling of 9995667691 in words is "nine billion, nine hundred ninety-five million, six hundred sixty-seven thousand, six hundred ninety-one".