99985565 has 8 divisors (see below), whose sum is σ = 120252600. Its totient is φ = 79808512.

The previous prime is 99985559. The next prime is 99985573. The reversal of 99985565 is 56558999.

It can be written as a sum of positive squares in 4 ways, for example, as 46607929 + 53377636 = 6827^2 + 7306^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 99985565 - 2⁴ = 99985549 is a prime.

It is a super-2 number, since 2×99985565² = 19994226416738450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99985565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20024 + ... + 24513.

It is an arithmetic number, because the mean of its divisors is an integer number (15031575).

Almost surely, 2^99985565 is an apocalyptic number.

It is an amenable number.

99985565 is a deficient number, since it is larger than the sum of its proper divisors (20267035).

99985565 is a wasteful number, since it uses less digits than its factorization.

99985565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44991.

The product of its digits is 4374000, while the sum is 56.

The square root of 99985565 is about 9999.2782239520. The cubic root of 99985565 is about 464.1365485083.

The spelling of 99985565 in words is "ninety-nine million, nine hundred eighty-five thousand, five hundred sixty-five".