8668561481 has 4 divisors (see below), whose sum is σ = 8687365764. Its totient is φ = 8649757200.

The previous prime is 8668561469. The next prime is 8668561493. The reversal of 8668561481 is 1841658668.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8668561469) and next prime (8668561493).

It can be written as a sum of positive squares in 2 ways, for example, as 5204179600 + 3464381881 = 72140^2 + 58859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8668561481 is a prime.

It is a super-2 number, since 2×8668561481² (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 (8668561411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9401450 + ... + 9402371.

It is an arithmetic number, because the mean of its divisors is an integer number (2171841441).

Almost surely, 2^8668561481 is an apocalyptic number.

It is an amenable number.

8668561481 is a deficient number, since it is larger than the sum of its proper divisors (18804283).

8668561481 is a wasteful number, since it uses less digits than its factorization.

8668561481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18804282.

The product of its digits is 2211840, while the sum is 53.

The square root of 8668561481 is about 93105.1098544006. The cubic root of 8668561481 is about 2054.2297345076.

The spelling of 8668561481 in words is "eight billion, six hundred sixty-eight million, five hundred sixty-one thousand, four hundred eighty-one".