8643376561481 has 2 divisors, whose sum is σ = 8643376561482. Its totient is φ = 8643376561480.

The previous prime is 8643376561433. The next prime is 8643376561499. The reversal of 8643376561481 is 1841656733468.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5986854708025 + 2656521853456 = 2446805^2 + 1629884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8643376561481 is a prime.

It is a super-2 number, since 2×8643376561481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8643376561181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321688280740 + 4321688280741.

It is an arithmetic number, because the mean of its divisors is an integer number (4321688280741).

Almost surely, 2^{8643376561481} is an apocalyptic number.

It is an amenable number.

8643376561481 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643376561481 is an equidigital number, since it uses as much as digits as its factorization.

8643376561481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69672960, while the sum is 62.

The spelling of 8643376561481 in words is "eight trillion, six hundred forty-three billion, three hundred seventy-six million, five hundred sixty-one thousand, four hundred eighty-one".