78369515369 has 2 divisors, whose sum is σ = 78369515370. Its totient is φ = 78369515368.

The previous prime is 78369515303. The next prime is 78369515377. The reversal of 78369515369 is 96351596387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49981309225 + 28388206144 = 223565^2 + 168488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78369515369 is a prime.

It is a super-2 number, since 2×78369515369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78369514369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39184757684 + 39184757685.

It is an arithmetic number, because the mean of its divisors is an integer number (39184757685).

Almost surely, 2^78369515369 is an apocalyptic number.

It is an amenable number.

78369515369 is a deficient number, since it is larger than the sum of its proper divisors (1).

78369515369 is an equidigital number, since it uses as much as digits as its factorization.

78369515369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36741600, while the sum is 62.

The spelling of 78369515369 in words is "seventy-eight billion, three hundred sixty-nine million, five hundred fifteen thousand, three hundred sixty-nine".