8445252681 has 6 divisors (see below), whose sum is σ = 12198698330. Its totient is φ = 5630168448.

The previous prime is 8445252679. The next prime is 8445252703. The reversal of 8445252681 is 1862525448.

8445252681 is a `hidden beast` number, since 8 + 4 + 45 + 2 + 526 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8370603081 + 74649600 = 91491^2 + 8640^2 .

It is not a de Polignac number, because 8445252681 - 2¹ = 8445252679 is a prime.

It is a super-2 number, since 2×8445252681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8445252671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 469180696 + ... + 469180713.

Almost surely, 2^8445252681 is an apocalyptic number.

It is an amenable number.

8445252681 is a deficient number, since it is larger than the sum of its proper divisors (3753445649).

8445252681 is a wasteful number, since it uses less digits than its factorization.

8445252681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938361415 (or 938361412 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The square root of 8445252681 is about 91898.0559152369. The cubic root of 8445252681 is about 2036.4365479080.

It can be divided in two parts, 844 and 5252681, that added together give a palindrome (5253525).

The spelling of 8445252681 in words is "eight billion, four hundred forty-five million, two hundred fifty-two thousand, six hundred eighty-one".