78809709007 has 2 divisors, whose sum is σ = 78809709008. Its totient is φ = 78809709006.

The previous prime is 78809708969. The next prime is 78809709031. The reversal of 78809709007 is 70090790887.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78809709007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78809709067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39404854503 + 39404854504.

It is an arithmetic number, because the mean of its divisors is an integer number (39404854504).

Almost surely, 2^78809709007 is an apocalyptic number.

78809709007 is a deficient number, since it is larger than the sum of its proper divisors (1).

78809709007 is an equidigital number, since it uses as much as digits as its factorization.

78809709007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The spelling of 78809709007 in words is "seventy-eight billion, eight hundred nine million, seven hundred nine thousand, seven".