993281168897 has 2 divisors, whose sum is σ = 993281168898. Its totient is φ = 993281168896.

The previous prime is 993281168863. The next prime is 993281168909. The reversal of 993281168897 is 798861182399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564408115441 + 428873053456 = 751271^2 + 654884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993281168897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 993281168897.

It is not a weakly prime, because it can be changed into another prime (993281168827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496640584448 + 496640584449.

It is an arithmetic number, because the mean of its divisors is an integer number (496640584449).

Almost surely, 2^993281168897 is an apocalyptic number.

It is an amenable number.

993281168897 is a deficient number, since it is larger than the sum of its proper divisors (1).

993281168897 is an equidigital number, since it uses as much as digits as its factorization.

993281168897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94058496, while the sum is 71.

The spelling of 993281168897 in words is "nine hundred ninety-three billion, two hundred eighty-one million, one hundred sixty-eight thousand, eight hundred ninety-seven".