9890216565 has 32 divisors (see below), whose sum is σ = 16840327680. Its totient is φ = 4939275264.

The previous prime is 9890216537. The next prime is 9890216569. The reversal of 9890216565 is 5656120989.

9890216565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9890216565 - 2⁸ = 9890216309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9890216569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48205 + ... + 148674.

It is an arithmetic number, because the mean of its divisors is an integer number (526260240).

Almost surely, 2^9890216565 is an apocalyptic number.

It is an amenable number.

9890216565 is a deficient number, since it is larger than the sum of its proper divisors (6950111115).

9890216565 is a wasteful number, since it uses less digits than its factorization.

9890216565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197101.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The square root of 9890216565 is about 99449.5679477794. The cubic root of 9890216565 is about 2146.5216201710.

The spelling of 9890216565 in words is "nine billion, eight hundred ninety million, two hundred sixteen thousand, five hundred sixty-five".