78076838367569 has 2 divisors, whose sum is σ = 78076838367570. Its totient is φ = 78076838367568.

The previous prime is 78076838367559. The next prime is 78076838367589. The reversal of 78076838367569 is 96576383867087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77816886246544 + 259952121025 = 8821388^2 + 509855^2 .

It is a cyclic number.

It is not a de Polignac number, because 78076838367569 - 2⁴ = 78076838367553 is a prime.

It is a super-2 number, since 2×78076838367569² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78076838367529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39038419183784 + 39038419183785.

It is an arithmetic number, because the mean of its divisors is an integer number (39038419183785).

Almost surely, 2^{78076838367569} is an apocalyptic number.

It is an amenable number.

78076838367569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78076838367569 is an equidigital number, since it uses as much as digits as its factorization.

78076838367569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15362887680, while the sum is 83.

The spelling of 78076838367569 in words is "seventy-eight trillion, seventy-six billion, eight hundred thirty-eight million, three hundred sixty-seven thousand, five hundred sixty-nine".