8418668661 has 48 divisors (see below), whose sum is σ = 13633716096. Its totient is φ = 5160511296.

The previous prime is 8418668659. The next prime is 8418668663. The reversal of 8418668661 is 1668668148.

It is an interprime number because it is at equal distance from previous prime (8418668659) and next prime (8418668663).

It is not a de Polignac number, because 8418668661 - 2¹ = 8418668659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8418668598 and 8418668607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8418668663) 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 47 ways as a sum of consecutive naturals, for example, 825751 + ... + 835883.

It is an arithmetic number, because the mean of its divisors is an integer number (284035752).

Almost surely, 2^8418668661 is an apocalyptic number.

8418668661 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8418668661 is a deficient number, since it is larger than the sum of its proper divisors (5215047435).

8418668661 is a wasteful number, since it uses less digits than its factorization.

8418668661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10424 (or 10412 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 8418668661 is about 91753.3032702365. The cubic root of 8418668661 is about 2034.2975326359.

The spelling of 8418668661 in words is "eight billion, four hundred eighteen million, six hundred sixty-eight thousand, six hundred sixty-one".