99897989057 has 2 divisors, whose sum is σ = 99897989058. Its totient is φ = 99897989056.

The previous prime is 99897989033. The next prime is 99897989123. The reversal of 99897989057 is 75098979899.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96594153616 + 3303835441 = 310796^2 + 57479^2 .

It is a cyclic number.

It is not a de Polignac number, because 99897989057 - 2²⁴ = 99881211841 is a prime.

It is not a weakly prime, because it can be changed into another prime (99897983057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49948994528 + 49948994529.

It is an arithmetic number, because the mean of its divisors is an integer number (49948994529).

Almost surely, 2^99897989057 is an apocalyptic number.

It is an amenable number.

99897989057 is a deficient number, since it is larger than the sum of its proper divisors (1).

99897989057 is an equidigital number, since it uses as much as digits as its factorization.

99897989057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 925888320, while the sum is 80.

The spelling of 99897989057 in words is "ninety-nine billion, eight hundred ninety-seven million, nine hundred eighty-nine thousand, fifty-seven".