865165608 has 192 divisors, whose sum is σ = 2659737600. Its totient is φ = 252616320.

The previous prime is 865165597. The next prime is 865165619. The reversal of 865165608 is 806561568.

865165608 is a `hidden beast` number, since 86 + 5 + 1 + 6 + 560 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (865165597) and next prime (865165619).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 974941 + ... + 975827.

It is an arithmetic number, because the mean of its divisors is an integer number (13852800).

Almost surely, 2^865165608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865165608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1329868800).

865165608 is an abundant number, since it is smaller than the sum of its proper divisors (1794571992).

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

865165608 is a wasteful number, since it uses less digits than its factorization.

865165608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 865165608 is about 29413.6976254262. The cubic root of 865165608 is about 952.8687459783.

The spelling of 865165608 in words is "eight hundred sixty-five million, one hundred sixty-five thousand, six hundred eight".