99891566 has 8 divisors (see below), whose sum is σ = 150371424. Its totient is φ = 49767760.

The previous prime is 99891559. The next prime is 99891593. The reversal of 99891566 is 66519899.

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

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, 88310 + ... + 89433.

It is an arithmetic number, because the mean of its divisors is an integer number (18796428).

Almost surely, 2^99891566 is an apocalyptic number.

99891566 is a deficient number, since it is larger than the sum of its proper divisors (50479858).

99891566 is a wasteful number, since it uses less digits than its factorization.

99891566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178026.

The product of its digits is 1049760, while the sum is 53.

The square root of 99891566 is about 9994.5768294611. The cubic root of 99891566 is about 463.9910540041.

The spelling of 99891566 in words is "ninety-nine million, eight hundred ninety-one thousand, five hundred sixty-six".