8491761289394 has 16 divisors (see below), whose sum is σ = 12831387168600. Its totient is φ = 4214668934400.

The previous prime is 8491761289391. The next prime is 8491761289421. The reversal of 8491761289394 is 4939821671948.

It can be written as a sum of positive squares in 4 ways, for example, as 4005053595169 + 4486707694225 = 2001263^2 + 2118185^2 .

It is a super-2 number, since 2×8491761289394² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8491761289391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8711657 + ... + 9637244.

Almost surely, 2^{8491761289394} is an apocalyptic number.

8491761289394 is a deficient number, since it is larger than the sum of its proper divisors (4339625879206).

8491761289394 is a wasteful number, since it uses less digits than its factorization.

8491761289394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18350605.

The product of its digits is 188116992, while the sum is 71.

The spelling of 8491761289394 in words is "eight trillion, four hundred ninety-one billion, seven hundred sixty-one million, two hundred eighty-nine thousand, three hundred ninety-four".