8425587681 has 135 divisors (see below), whose sum is σ = 15457563297. Its totient is φ = 4560176880.

The previous prime is 8425587673. The next prime is 8425587749. The reversal of 8425587681 is 1867855248.

The square root of 8425587681 is 91791.

It is a perfect power (a square), and thus also a powerful number.

8425587681 is a `hidden beast` number, since 8 + 4 + 2 + 558 + 7 + 6 + 81 = 666.

It is not a de Polignac number, because 8425587681 - 2³ = 8425587673 is a prime.

It is a super-2 number, since 2×8425587681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8425587641) 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 134 ways as a sum of consecutive naturals, for example, 179267800 + ... + 179267846.

Almost surely, 2^8425587681 is an apocalyptic number.

8425587681 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

8425587681 is the 91791-st square number.

8425587681 is the 45896-th centered octagonal number.

It is an amenable number.

8425587681 is a deficient number, since it is larger than the sum of its proper divisors (7031975616).

8425587681 is an equidigital number, since it uses as much as digits as its factorization.

8425587681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 88 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The cubic root of 8425587681 is about 2034.8546868854.

The spelling of 8425587681 in words is "eight billion, four hundred twenty-five million, five hundred eighty-seven thousand, six hundred eighty-one".