90016565 has 4 divisors (see below), whose sum is σ = 108019884. Its totient is φ = 72013248.

The previous prime is 90016559. The next prime is 90016573. The reversal of 90016565 is 56561009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56561009 = 541 ⋅104549.

It can be written as a sum of positive squares in 2 ways, for example, as 29441476 + 60575089 = 5426^2 + 7783^2 .

It is a cyclic number.

It is not a de Polignac number, because 90016565 - 2¹² = 90012469 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, 9001652 + ... + 9001661.

It is an arithmetic number, because the mean of its divisors is an integer number (27004971).

Almost surely, 2^90016565 is an apocalyptic number.

It is an amenable number.

90016565 is a deficient number, since it is larger than the sum of its proper divisors (18003319).

90016565 is a wasteful number, since it uses less digits than its factorization.

90016565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18003318.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 90016565 is about 9487.7059924937. The cubic root of 90016565 is about 448.1679672171.

The spelling of 90016565 in words is "ninety million, sixteen thousand, five hundred sixty-five".