8294778641 has 2 divisors, whose sum is σ = 8294778642. Its totient is φ = 8294778640.

The previous prime is 8294778631. The next prime is 8294778649. The reversal of 8294778641 is 1468774928.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5745033616 + 2549745025 = 75796^2 + 50495^2 .

It is a cyclic number.

It is not a de Polignac number, because 8294778641 - 2⁶ = 8294778577 is a prime.

It is not a weakly prime, because it can be changed into another prime (8294778649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4147389320 + 4147389321.

It is an arithmetic number, because the mean of its divisors is an integer number (4147389321).

Almost surely, 2^8294778641 is an apocalyptic number.

It is an amenable number.

8294778641 is a deficient number, since it is larger than the sum of its proper divisors (1).

8294778641 is an equidigital number, since it uses as much as digits as its factorization.

8294778641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 56.

The square root of 8294778641 is about 91075.6753529723. The cubic root of 8294778641 is about 2024.2691985498.

The spelling of 8294778641 in words is "eight billion, two hundred ninety-four million, seven hundred seventy-eight thousand, six hundred forty-one".