99667565 has 4 divisors (see below), whose sum is σ = 119601084. Its totient is φ = 79734048.

The previous prime is 99667553. The next prime is 99667571. The reversal of 99667565 is 56576699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56576699 = 19 ⋅2977721.

It can be written as a sum of positive squares in 2 ways, for example, as 17547721 + 82119844 = 4189^2 + 9062^2 .

It is a cyclic number.

It is not a de Polignac number, because 99667565 - 2²⁴ = 82890349 is a prime.

It is a Duffinian 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, 9966752 + ... + 9966761.

It is an arithmetic number, because the mean of its divisors is an integer number (29900271).

Almost surely, 2^99667565 is an apocalyptic number.

It is an amenable number.

99667565 is a deficient number, since it is larger than the sum of its proper divisors (19933519).

99667565 is a wasteful number, since it uses less digits than its factorization.

99667565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19933518.

The product of its digits is 3061800, while the sum is 53.

The square root of 99667565 is about 9983.3644128620. The cubic root of 99667565 is about 463.6439701605.

The spelling of 99667565 in words is "ninety-nine million, six hundred sixty-seven thousand, five hundred sixty-five".