8105685381 has 12 divisors (see below), whose sum is σ = 11710883340. Its totient is φ = 5402557440.

The previous prime is 8105685311. The next prime is 8105685389. The reversal of 8105685381 is 1835865018.

8105685381 is a `hidden beast` number, since 8 + 1 + 0 + 568 + 5 + 3 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6821108100 + 1284577281 = 82590^2 + 35841^2 .

It is not a de Polignac number, because 8105685381 - 2⁹ = 8105684869 is a prime.

It is a super-2 number, since 2×8105685381² (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 (8105685389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60166 + ... + 140823.

It is an arithmetic number, because the mean of its divisors is an integer number (975906945).

Almost surely, 2^8105685381 is an apocalyptic number.

It is an amenable number.

8105685381 is a deficient number, since it is larger than the sum of its proper divisors (3605197959).

8105685381 is a wasteful number, since it uses less digits than its factorization.

8105685381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205476 (or 205473 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 8105685381 is about 90031.5799094962. The cubic root of 8105685381 is about 2008.7686145985.

The spelling of 8105685381 in words is "eight billion, one hundred five million, six hundred eighty-five thousand, three hundred eighty-one".