8256981660 has 36 divisors (see below), whose sum is σ = 23121519624. Its totient is φ = 2201674080.

The previous prime is 8256981613. The next prime is 8256981661. The reversal of 8256981660 is 661896528.

It is a super-2 number, since 2×8256981660² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8256981661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 697995 + ... + 709725.

It is an arithmetic number, because the mean of its divisors is an integer number (642264434).

Almost surely, 2^8256981660 is an apocalyptic number.

It is an amenable number.

8256981660 is an abundant number, since it is smaller than the sum of its proper divisors (14864537964).

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

8256981660 is an equidigital number, since it uses as much as digits as its factorization.

8256981660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23474 (or 11741 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 8256981660 is about 90867.9352687184. The cubic root of 8256981660 is about 2021.1898407873.

The spelling of 8256981660 in words is "eight billion, two hundred fifty-six million, nine hundred eighty-one thousand, six hundred sixty".