99857866 has 4 divisors (see below), whose sum is σ = 149786802. Its totient is φ = 49928932.

The previous prime is 99857861. The next prime is 99857867. The reversal of 99857866 is 66875899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66875899 = 1571 ⋅42569.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 45171841 = 7395^2 + 6721^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99857866.

It is not an unprimeable number, because it can be changed into a prime (99857861) 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, 24964465 + ... + 24964468.

Almost surely, 2^99857866 is an apocalyptic number.

99857866 is a deficient number, since it is larger than the sum of its proper divisors (49928936).

99857866 is a wasteful number, since it uses less digits than its factorization.

99857866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49928935.

The product of its digits is 6531840, while the sum is 58.

The square root of 99857866 is about 9992.8907729445. The cubic root of 99857866 is about 463.9388698946.

The spelling of 99857866 in words is "ninety-nine million, eight hundred fifty-seven thousand, eight hundred sixty-six".