78711051779 has 2 divisors, whose sum is σ = 78711051780. Its totient is φ = 78711051778.

The previous prime is 78711051737. The next prime is 78711051781. The reversal of 78711051779 is 97715011787.

It is a strong prime.

It is an emirp because it is prime and its reverse (97715011787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78711051779 - 2¹⁶ = 78710986243 is a prime.

Together with 78711051781, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78711051779.

It is not a weakly prime, because it can be changed into another prime (78711051799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39355525889 + 39355525890.

It is an arithmetic number, because the mean of its divisors is an integer number (39355525890).

Almost surely, 2^78711051779 is an apocalyptic number.

78711051779 is a deficient number, since it is larger than the sum of its proper divisors (1).

78711051779 is an equidigital number, since it uses as much as digits as its factorization.

78711051779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864360, while the sum is 53.

The spelling of 78711051779 in words is "seventy-eight billion, seven hundred eleven million, fifty-one thousand, seven hundred seventy-nine".