8605990681 has 4 divisors (see below), whose sum is σ = 8630370612. Its totient is φ = 8581610752.

The previous prime is 8605990667. The next prime is 8605990709. The reversal of 8605990681 is 1860995068.

8605990681 is digitally balanced in base 2, 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 6381453456 + 2224537225 = 79884^2 + 47165^2 .

It is a cyclic number.

It is not a de Polignac number, because 8605990681 - 2⁵ = 8605990649 is a prime.

It is a super-2 number, since 2×8605990681² (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 (8605993681) 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 3 ways as a sum of consecutive naturals, for example, 12189436 + ... + 12190141.

It is an arithmetic number, because the mean of its divisors is an integer number (2157592653).

Almost surely, 2^8605990681 is an apocalyptic number.

It is an amenable number.

8605990681 is a deficient number, since it is larger than the sum of its proper divisors (24379931).

8605990681 is a wasteful number, since it uses less digits than its factorization.

8605990681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24379930.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 8605990681 is about 92768.4789192967. The cubic root of 8605990681 is about 2049.2752290961.

The spelling of 8605990681 in words is "eight billion, six hundred five million, nine hundred ninety thousand, six hundred eighty-one".