8685647861 has 16 divisors (see below), whose sum is σ = 9637289280. Its totient is φ = 7762043520.

The previous prime is 8685647857. The next prime is 8685647863. The reversal of 8685647861 is 1687465868.

It is a happy number.

It is not a de Polignac number, because 8685647861 - 2² = 8685647857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8685647861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8685647863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143726 + ... + 195008.

It is an arithmetic number, because the mean of its divisors is an integer number (602330580).

Almost surely, 2^8685647861 is an apocalyptic number.

It is an amenable number.

8685647861 is a deficient number, since it is larger than the sum of its proper divisors (951641419).

8685647861 is a wasteful number, since it uses less digits than its factorization.

8685647861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51556.

The product of its digits is 15482880, while the sum is 59.

The square root of 8685647861 is about 93196.8232344858. The cubic root of 8685647861 is about 2055.5785286147.

The spelling of 8685647861 in words is "eight billion, six hundred eighty-five million, six hundred forty-seven thousand, eight hundred sixty-one".