7978517164841 has 2 divisors, whose sum is σ = 7978517164842. Its totient is φ = 7978517164840.

The previous prime is 7978517164801. The next prime is 7978517164903. The reversal of 7978517164841 is 1484617158797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5617392970816 + 2361124194025 = 2370104^2 + 1536595^2 .

It is a cyclic number.

It is not a de Polignac number, because 7978517164841 - 2¹⁰ = 7978517163817 is a prime.

It is a super-2 number, since 2×7978517164841² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7978517164801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989258582420 + 3989258582421.

It is an arithmetic number, because the mean of its divisors is an integer number (3989258582421).

Almost surely, 2^{7978517164841} is an apocalyptic number.

It is an amenable number.

7978517164841 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978517164841 is an equidigital number, since it uses as much as digits as its factorization.

7978517164841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94832640, while the sum is 68.

The spelling of 7978517164841 in words is "seven trillion, nine hundred seventy-eight billion, five hundred seventeen million, one hundred sixty-four thousand, eight hundred forty-one".