78909614580691 has 2 divisors, whose sum is σ = 78909614580692. Its totient is φ = 78909614580690.

The previous prime is 78909614580617. The next prime is 78909614580739. The reversal of 78909614580691 is 19608541690987.

It is a strong prime.

It is an emirp because it is prime and its reverse (19608541690987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78909614580691 - 2²³ = 78909606192083 is a prime.

It is not a weakly prime, because it can be changed into another prime (78909614550691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39454807290345 + 39454807290346.

It is an arithmetic number, because the mean of its divisors is an integer number (39454807290346).

Almost surely, 2^{78909614580691} is an apocalyptic number.

78909614580691 is a deficient number, since it is larger than the sum of its proper divisors (1).

78909614580691 is an equidigital number, since it uses as much as digits as its factorization.

78909614580691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235146240, while the sum is 73.

The spelling of 78909614580691 in words is "seventy-eight trillion, nine hundred nine billion, six hundred fourteen million, five hundred eighty thousand, six hundred ninety-one".