8644417078397 has 2 divisors, whose sum is σ = 8644417078398. Its totient is φ = 8644417078396.

The previous prime is 8644417078393. The next prime is 8644417078463. The reversal of 8644417078397 is 7938707144468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7859786067961 + 784631010436 = 2803531^2 + 885794^2 .

It is a cyclic number.

It is not a de Polignac number, because 8644417078397 - 2² = 8644417078393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8644417078393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322208539198 + 4322208539199.

It is an arithmetic number, because the mean of its divisors is an integer number (4322208539199).

Almost surely, 2^{8644417078397} is an apocalyptic number.

It is an amenable number.

8644417078397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8644417078397 is an equidigital number, since it uses as much as digits as its factorization.

8644417078397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 227598336, while the sum is 68.

The spelling of 8644417078397 in words is "eight trillion, six hundred forty-four billion, four hundred seventeen million, seventy-eight thousand, three hundred ninety-seven".