9995007661 has 2 divisors, whose sum is σ = 9995007662. Its totient is φ = 9995007660.

The previous prime is 9995007647. The next prime is 9995007683. The reversal of 9995007661 is 1667005999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9943081225 + 51926436 = 99715^2 + 7206^2 .

It is a cyclic number.

It is not a de Polignac number, because 9995007661 - 2⁵ = 9995007629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9995007599 and 9995007608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9995007601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997503830 + 4997503831.

It is an arithmetic number, because the mean of its divisors is an integer number (4997503831).

Almost surely, 2^9995007661 is an apocalyptic number.

It is an amenable number.

9995007661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9995007661 is an equidigital number, since it uses as much as digits as its factorization.

9995007661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 9995007661 is about 99975.0351887910. The cubic root of 9995007661 is about 2154.0761080756.

The spelling of 9995007661 in words is "nine billion, nine hundred ninety-five million, seven thousand, six hundred sixty-one".