865005853545 has 32 divisors (see below), whose sum is σ = 1575295223040. Its totient is φ = 450084343680.

The previous prime is 865005853531. The next prime is 865005853559. The reversal of 865005853545 is 545358500568.

865005853545 is a `hidden beast` number, since 8 + 6 + 5 + 0 + 0 + 585 + 3 + 54 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (865005853531) and next prime (865005853559).

It is not a de Polignac number, because 865005853545 - 2³² = 860710886249 is a prime.

It is a super-2 number, since 2×865005853545² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 865005853491 and 865005853500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78134109 + ... + 78145178.

It is an arithmetic number, because the mean of its divisors is an integer number (49227975720).

Almost surely, 2^865005853545 is an apocalyptic number.

It is an amenable number.

865005853545 is a deficient number, since it is larger than the sum of its proper divisors (710289369495).

865005853545 is a wasteful number, since it uses less digits than its factorization.

865005853545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156279342 (or 156279336 counting only the distinct ones).

The product of its (nonzero) digits is 14400000, while the sum is 54.

The spelling of 865005853545 in words is "eight hundred sixty-five billion, five million, eight hundred fifty-three thousand, five hundred forty-five".