7985255865 has 32 divisors (see below), whose sum is σ = 13025702016. Its totient is φ = 4175808000.

The previous prime is 7985255857. The next prime is 7985255893. The reversal of 7985255865 is 5685525897.

It is not a de Polignac number, because 7985255865 - 2³ = 7985255857 is a prime.

It is a super-2 number, since 2×7985255865² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7985255799 and 7985255808.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2384122 + ... + 2387468.

It is an arithmetic number, because the mean of its divisors is an integer number (407053188).

Almost surely, 2^7985255865 is an apocalyptic number.

It is an amenable number.

7985255865 is a deficient number, since it is larger than the sum of its proper divisors (5040446151).

7985255865 is a wasteful number, since it uses less digits than its factorization.

7985255865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409.

The product of its digits is 30240000, while the sum is 60.

The square root of 7985255865 is about 89360.2588682463. The cubic root of 7985255865 is about 1998.7705664848.

The spelling of 7985255865 in words is "seven billion, nine hundred eighty-five million, two hundred fifty-five thousand, eight hundred sixty-five".