8991896120993 has 2 divisors, whose sum is σ = 8991896120994. Its totient is φ = 8991896120992.

The previous prime is 8991896120903. The next prime is 8991896121029. The reversal of 8991896120993 is 3990216981998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7428115858849 + 1563780262144 = 2725457^2 + 1250512^2 .

It is a cyclic number.

It is not a de Polignac number, because 8991896120993 - 2²⁰ = 8991895072417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8991896120993.

It is not a weakly prime, because it can be changed into another prime (8991896120903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4495948060496 + 4495948060497.

It is an arithmetic number, because the mean of its divisors is an integer number (4495948060497).

Almost surely, 2^{8991896120993} is an apocalyptic number.

It is an amenable number.

8991896120993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8991896120993 is an equidigital number, since it uses as much as digits as its factorization.

8991896120993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136048896, while the sum is 74.

The spelling of 8991896120993 in words is "eight trillion, nine hundred ninety-one billion, eight hundred ninety-six million, one hundred twenty thousand, nine hundred ninety-three".