8913790485581 has 2 divisors, whose sum is σ = 8913790485582. Its totient is φ = 8913790485580.

The previous prime is 8913790485569. The next prime is 8913790485623. The reversal of 8913790485581 is 1855840973198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6227190848356 + 2686599637225 = 2495434^2 + 1639085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8913790485581 is a prime.

It is a super-2 number, since 2×8913790485581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8913790485181) 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 as a sum of consecutive naturals, namely, 4456895242790 + 4456895242791.

It is an arithmetic number, because the mean of its divisors is an integer number (4456895242791).

Almost surely, 2^{8913790485581} is an apocalyptic number.

It is an amenable number.

8913790485581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8913790485581 is an equidigital number, since it uses as much as digits as its factorization.

8913790485581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87091200, while the sum is 68.

The spelling of 8913790485581 in words is "eight trillion, nine hundred thirteen billion, seven hundred ninety million, four hundred eighty-five thousand, five hundred eighty-one".