8256412985 has 4 divisors (see below), whose sum is σ = 9907695588. Its totient is φ = 6605130384.

The previous prime is 8256412961. The next prime is 8256412987. The reversal of 8256412985 is 5892146528.

It is a happy number.

8256412985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5634153721 + 2622259264 = 75061^2 + 51208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8256412985 is a prime.

It is a super-2 number, since 2×8256412985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8256412987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825641294 + ... + 825641303.

It is an arithmetic number, because the mean of its divisors is an integer number (2476923897).

Almost surely, 2^8256412985 is an apocalyptic number.

It is an amenable number.

8256412985 is a deficient number, since it is larger than the sum of its proper divisors (1651282603).

8256412985 is a wasteful number, since it uses less digits than its factorization.

8256412985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651282602.

The product of its digits is 1382400, while the sum is 50.

The square root of 8256412985 is about 90864.8060857448. The cubic root of 8256412985 is about 2021.1434385801.

The spelling of 8256412985 in words is "eight billion, two hundred fifty-six million, four hundred twelve thousand, nine hundred eighty-five".