78326674967641 has 2 divisors, whose sum is σ = 78326674967642. Its totient is φ = 78326674967640.

The previous prime is 78326674967627. The next prime is 78326674967657. The reversal of 78326674967641 is 14676947662387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77630126153616 + 696548814025 = 8810796^2 + 834595^2 .

It is an emirp because it is prime and its reverse (14676947662387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78326674967641 - 2¹¹ = 78326674965593 is a prime.

It is a super-2 number, since 2×78326674967641² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78326674967041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39163337483820 + 39163337483821.

It is an arithmetic number, because the mean of its divisors is an integer number (39163337483821).

Almost surely, 2^{78326674967641} is an apocalyptic number.

It is an amenable number.

78326674967641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78326674967641 is an equidigital number, since it uses as much as digits as its factorization.

78326674967641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072577536, while the sum is 76.

The spelling of 78326674967641 in words is "seventy-eight trillion, three hundred twenty-six billion, six hundred seventy-four million, nine hundred sixty-seven thousand, six hundred forty-one".