78396434807029 has 2 divisors, whose sum is σ = 78396434807030. Its totient is φ = 78396434807028.

The previous prime is 78396434807023. The next prime is 78396434807051. The reversal of 78396434807029 is 92070843469387.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69074832010129 + 9321602796900 = 8311127^2 + 3053130^2 .

It is a cyclic number.

It is not a de Polignac number, because 78396434807029 - 2³ = 78396434807021 is a prime.

It is a super-2 number, since 2×78396434807029² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78396434807021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39198217403514 + 39198217403515.

It is an arithmetic number, because the mean of its divisors is an integer number (39198217403515).

Almost surely, 2^{78396434807029} is an apocalyptic number.

It is an amenable number.

78396434807029 is a deficient number, since it is larger than the sum of its proper divisors (1).

78396434807029 is an equidigital number, since it uses as much as digits as its factorization.

78396434807029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 438939648, while the sum is 70.

The spelling of 78396434807029 in words is "seventy-eight trillion, three hundred ninety-six billion, four hundred thirty-four million, eight hundred seven thousand, twenty-nine".