99985566 has 8 divisors (see below), whose sum is σ = 199971144. Its totient is φ = 33328520.

The previous prime is 99985559. The next prime is 99985573. The reversal of 99985566 is 66558999.

It is an interprime number because it is at equal distance from previous prime (99985559) and next prime (99985573).

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

99985566 is an admirable number.

It is a super-2 number, since 2×99985566² = 19994226816680712, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8332125 + ... + 8332136.

It is an arithmetic number, because the mean of its divisors is an integer number (24996393).

Almost surely, 2^99985566 is an apocalyptic number.

99985566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99985566 is a wasteful number, since it uses less digits than its factorization.

99985566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16664266.

The product of its digits is 5248800, while the sum is 57.

The square root of 99985566 is about 9999.2782739556. The cubic root of 99985566 is about 464.1365500556.

The spelling of 99985566 in words is "ninety-nine million, nine hundred eighty-five thousand, five hundred sixty-six".