9951911633 has 2 divisors, whose sum is σ = 9951911634. Its totient is φ = 9951911632.

The previous prime is 9951911587. The next prime is 9951911657. The reversal of 9951911633 is 3361191599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8091542209 + 1860369424 = 89953^2 + 43132^2 .

It is a cyclic number.

It is not a de Polignac number, because 9951911633 - 2²⁶ = 9884802769 is a prime.

It is a super-5 number, since 5×9951911633⁵ (a number of 51 digits) contains 55555 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9951011633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4975955816 + 4975955817.

It is an arithmetic number, because the mean of its divisors is an integer number (4975955817).

Almost surely, 2^9951911633 is an apocalyptic number.

It is an amenable number.

9951911633 is a deficient number, since it is larger than the sum of its proper divisors (1).

9951911633 is an equidigital number, since it uses as much as digits as its factorization.

9951911633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196830, while the sum is 47.

The square root of 9951911633 is about 99759.2684064995. The cubic root of 9951911633 is about 2150.9756979815.

The spelling of 9951911633 in words is "nine billion, nine hundred fifty-one million, nine hundred eleven thousand, six hundred thirty-three".