77964165197 has 2 divisors, whose sum is σ = 77964165198. Its totient is φ = 77964165196.

The previous prime is 77964165179. The next prime is 77964165217. The reversal of 77964165197 is 79156146977.

Together with previous prime (77964165179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77558908036 + 405257161 = 278494^2 + 20131^2 .

It is an emirp because it is prime and its reverse (79156146977) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77964165197 is a prime.

It is a super-2 number, since 2×77964165197² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77964162197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38982082598 + 38982082599.

It is an arithmetic number, because the mean of its divisors is an integer number (38982082599).

Almost surely, 2^77964165197 is an apocalyptic number.

It is an amenable number.

77964165197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77964165197 is an equidigital number, since it uses as much as digits as its factorization.

77964165197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20003760, while the sum is 62.

The spelling of 77964165197 in words is "seventy-seven billion, nine hundred sixty-four million, one hundred sixty-five thousand, one hundred ninety-seven".