77349317779 has 2 divisors, whose sum is σ = 77349317780. Its totient is φ = 77349317778.

The previous prime is 77349317777. The next prime is 77349317797. The reversal of 77349317779 is 97771394377.

Together with next prime (77349317797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77349317779 - 2¹ = 77349317777 is a prime.

Together with 77349317777, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 77349317779.

It is not a weakly prime, because it can be changed into another prime (77349317777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38674658889 + 38674658890.

It is an arithmetic number, because the mean of its divisors is an integer number (38674658890).

Almost surely, 2^77349317779 is an apocalyptic number.

77349317779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77349317779 is an equidigital number, since it uses as much as digits as its factorization.

77349317779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49009212, while the sum is 64.

The spelling of 77349317779 in words is "seventy-seven billion, three hundred forty-nine million, three hundred seventeen thousand, seven hundred seventy-nine".