9950665121 has 2 divisors, whose sum is σ = 9950665122. Its totient is φ = 9950665120.

The previous prime is 9950665117. The next prime is 9950665133. The reversal of 9950665121 is 1215660599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6717605521 + 3233059600 = 81961^2 + 56860^2 .

It is a cyclic number.

It is not a de Polignac number, because 9950665121 - 2² = 9950665117 is a prime.

It is not a weakly prime, because it can be changed into another prime (9950665721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4975332560 + 4975332561.

It is an arithmetic number, because the mean of its divisors is an integer number (4975332561).

Almost surely, 2^9950665121 is an apocalyptic number.

It is an amenable number.

9950665121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9950665121 is an equidigital number, since it uses as much as digits as its factorization.

9950665121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 9950665121 is about 99753.0206109068. The cubic root of 9950665121 is about 2150.8858884698.

The spelling of 9950665121 in words is "nine billion, nine hundred fifty million, six hundred sixty-five thousand, one hundred twenty-one".