99999566 has 4 divisors (see below), whose sum is σ = 149999352. Its totient is φ = 49999782.

The previous prime is 99999563. The next prime is 99999587. The reversal of 99999566 is 66599999.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99999499 and 99999508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999890 + ... + 24999893.

It is an arithmetic number, because the mean of its divisors is an integer number (37499838).

Almost surely, 2^99999566 is an apocalyptic number.

99999566 is a deficient number, since it is larger than the sum of its proper divisors (49999786).

99999566 is a wasteful number, since it uses less digits than its factorization.

99999566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999785.

The product of its digits is 10628820, while the sum is 62.

The square root of 99999566 is about 9999.9782999765. The cubic root of 99999566 is about 464.1582118771.

The spelling of 99999566 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred sixty-six".