1000865565 has 160 divisors (see below), whose sum is σ = 2287422720. Its totient is φ = 407586816.

The previous prime is 1000865561. The next prime is 1000865573. The reversal of 1000865565 is 5655680001.

1000865565 is a `hidden beast` number, since 10 + 0 + 0 + 86 + 5 + 565 = 666.

1000865565 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1000865565 - 2² = 1000865561 is a prime.

It is a super-4 number, since 4×1000865565⁴ (a number of 37 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000865561) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 915159 + ... + 916251.

It is an arithmetic number, because the mean of its divisors is an integer number (14296392).

Almost surely, 2^1000865565 is an apocalyptic number.

1000865565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1000865565 is an abundant number, since it is smaller than the sum of its proper divisors (1286557155).

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

1000865565 is a wasteful number, since it uses less digits than its factorization.

1000865565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 1000865565 is about 31636.4594257954. The cubic root of 1000865565 is about 1000.2884384619.

The spelling of 1000865565 in words is "one billion, eight hundred sixty-five thousand, five hundred sixty-five".