99568397857 has 4 divisors (see below), whose sum is σ = 99693327636. Its totient is φ = 99443468080.

The previous prime is 99568397849. The next prime is 99568397861. The reversal of 99568397857 is 75879386599.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54212602896 + 45355794961 = 232836^2 + 212969^2 .

It is a cyclic number.

It is not a de Polignac number, because 99568397857 - 2³ = 99568397849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99568397057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62463694 + ... + 62465287.

It is an arithmetic number, because the mean of its divisors is an integer number (24923331909).

Almost surely, 2^99568397857 is an apocalyptic number.

It is an amenable number.

99568397857 is a deficient number, since it is larger than the sum of its proper divisors (124929779).

99568397857 is a wasteful number, since it uses less digits than its factorization.

99568397857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124929778.

The product of its digits is 1028764800, while the sum is 76.

The spelling of 99568397857 in words is "ninety-nine billion, five hundred sixty-eight million, three hundred ninety-seven thousand, eight hundred fifty-seven".