99772868197 has 2 divisors, whose sum is σ = 99772868198. Its totient is φ = 99772868196.

The previous prime is 99772868179. The next prime is 99772868243. The reversal of 99772868197 is 79186827799.

Together with previous prime (99772868179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65491975396 + 34280892801 = 255914^2 + 185151^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99772868197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99772868177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49886434098 + 49886434099.

It is an arithmetic number, because the mean of its divisors is an integer number (49886434099).

Almost surely, 2^99772868197 is an apocalyptic number.

It is an amenable number.

99772868197 is a deficient number, since it is larger than the sum of its proper divisors (1).

99772868197 is an equidigital number, since it uses as much as digits as its factorization.

99772868197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192036096, while the sum is 73.

The spelling of 99772868197 in words is "ninety-nine billion, seven hundred seventy-two million, eight hundred sixty-eight thousand, one hundred ninety-seven".