9995475661 has 2 divisors, whose sum is σ = 9995475662. Its totient is φ = 9995475660.

The previous prime is 9995475647. The next prime is 9995475701. The reversal of 9995475661 is 1665745999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8650860100 + 1344615561 = 93010^2 + 36669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9995475661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9995475661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9995475641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997737830 + 4997737831.

It is an arithmetic number, because the mean of its divisors is an integer number (4997737831).

Almost surely, 2^9995475661 is an apocalyptic number.

It is an amenable number.

9995475661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9995475661 is an equidigital number, since it uses as much as digits as its factorization.

9995475661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18370800, while the sum is 61.

The square root of 9995475661 is about 99977.3757457156. The cubic root of 9995475661 is about 2154.1097279226.

The spelling of 9995475661 in words is "nine billion, nine hundred ninety-five million, four hundred seventy-five thousand, six hundred sixty-one".