8694778613481 has 27 divisors (see below), whose sum is σ = 13007515270789. Its totient is φ = 5596473980832.

The previous prime is 8694778613467. The next prime is 8694778613527. The reversal of 8694778613481 is 1843168774968.

The square root of 8694778613481 is 2948691.

It is a perfect power (a square), and thus also a powerful number.

8694778613481 is a `hidden beast` number, since 8 + 69 + 4 + 7 + 7 + 86 + 1 + 3 + 481 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 727617530025 + 7967161083456 = 853005^2 + 2822616^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8694778613481 is a prime.

It is a super-2 number, since 2×8694778613481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8694778613401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 256519171 + ... + 256553063.

Almost surely, 2^{8694778613481} is an apocalyptic number.

8694778613481 is the 2948691-st square number.

8694778613481 is the 1474346-th centered octagonal number.

It is an amenable number.

8694778613481 is a deficient number, since it is larger than the sum of its proper divisors (4312736657308).

8694778613481 is an frugal number, since it uses more digits than its factorization.

8694778613481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67850 (or 33925 counting only the distinct ones).

The product of its digits is 390168576, while the sum is 72.

The spelling of 8694778613481 in words is "eight trillion, six hundred ninety-four billion, seven hundred seventy-eight million, six hundred thirteen thousand, four hundred eighty-one".