99555565 has 8 divisors (see below), whose sum is σ = 119789208. Its totient is φ = 79429440.

The previous prime is 99555559. The next prime is 99555581. The reversal of 99555565 is 56555599.

It can be written as a sum of positive squares in 4 ways, for example, as 1901641 + 97653924 = 1379^2 + 9882^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99555565 - 2⁷ = 99555437 is a prime.

It is a super-2 number, since 2×99555565² = 19822621044938450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 24826 + ... + 28555.

It is an arithmetic number, because the mean of its divisors is an integer number (14973651).

Almost surely, 2^99555565 is an apocalyptic number.

It is an amenable number.

99555565 is a deficient number, since it is larger than the sum of its proper divisors (20233643).

99555565 is a wasteful number, since it uses less digits than its factorization.

99555565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53759.

The product of its digits is 1518750, while the sum is 49.

The square root of 99555565 is about 9977.7535046723. The cubic root of 99555565 is about 463.4702339741.

The spelling of 99555565 in words is "ninety-nine million, five hundred fifty-five thousand, five hundred sixty-five".