77379311917 has 2 divisors, whose sum is σ = 77379311918. Its totient is φ = 77379311916.

The previous prime is 77379311831. The next prime is 77379311923. The reversal of 77379311917 is 71911397377.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69376399236 + 8002912681 = 263394^2 + 89459^2 .

It is an emirp because it is prime and its reverse (71911397377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77379311917 - 2¹¹ = 77379309869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77379311617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38689655958 + 38689655959.

It is an arithmetic number, because the mean of its divisors is an integer number (38689655959).

Almost surely, 2^77379311917 is an apocalyptic number.

It is an amenable number.

77379311917 is a deficient number, since it is larger than the sum of its proper divisors (1).

77379311917 is an equidigital number, since it uses as much as digits as its factorization.

77379311917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1750329, while the sum is 55.

The spelling of 77379311917 in words is "seventy-seven billion, three hundred seventy-nine million, three hundred eleven thousand, nine hundred seventeen".