8778312040961 has 4 divisors (see below), whose sum is σ = 8778439485012. Its totient is φ = 8778184596912.

The previous prime is 8778312040919. The next prime is 8778312040987. The reversal of 8778312040961 is 1690402138778.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3260393590336 + 5517918450625 = 1805656^2 + 2349025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8778312040961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8778312040897 and 8778312040906.

It is not an unprimeable number, because it can be changed into a prime (8778312040261) 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 3 ways as a sum of consecutive naturals, for example, 63618650 + ... + 63756483.

It is an arithmetic number, because the mean of its divisors is an integer number (2194609871253).

Almost surely, 2^{8778312040961} is an apocalyptic number.

It is an amenable number.

8778312040961 is a deficient number, since it is larger than the sum of its proper divisors (127444051).

8778312040961 is a wasteful number, since it uses less digits than its factorization.

8778312040961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127444050.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 8778312040961 in words is "eight trillion, seven hundred seventy-eight billion, three hundred twelve million, forty thousand, nine hundred sixty-one".