8478740742161 has 2 divisors, whose sum is σ = 8478740742162. Its totient is φ = 8478740742160.

The previous prime is 8478740742127. The next prime is 8478740742179. The reversal of 8478740742161 is 1612470478748.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5618985793600 + 2859754948561 = 2370440^2 + 1691081^2 .

It is a cyclic number.

It is not a de Polignac number, because 8478740742161 - 2²² = 8478736547857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8478740742161.

It is not a weakly prime, because it can be changed into another prime (8478740747161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4239370371080 + 4239370371081.

It is an arithmetic number, because the mean of its divisors is an integer number (4239370371081).

Almost surely, 2^{8478740742161} is an apocalyptic number.

It is an amenable number.

8478740742161 is a deficient number, since it is larger than the sum of its proper divisors (1).

8478740742161 is an equidigital number, since it uses as much as digits as its factorization.

8478740742161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16859136, while the sum is 59.

The spelling of 8478740742161 in words is "eight trillion, four hundred seventy-eight billion, seven hundred forty million, seven hundred forty-two thousand, one hundred sixty-one".