77964366841 has 3 divisors (see below), whose sum is σ = 77964646063. Its totient is φ = 77964087620.

The previous prime is 77964366829. The next prime is 77964366853. The reversal of 77964366841 is 14866346977.

The square root of 77964366841 is 279221.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14866346977 = 739 ⋅20116843.

It is an interprime number because it is at equal distance from previous prime (77964366829) and next prime (77964366853).

It can be written as a sum of positive squares in only one way, i.e., 6728756841 + 71235610000 = 82029^2 + 266900^2 .

It is not a de Polignac number, because 77964366841 - 2²¹ = 77962269689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77964366841.

It is not an unprimeable number, because it can be changed into a prime (77964366811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 139611 + ... + 418831.

Almost surely, 2^77964366841 is an apocalyptic number.

77964366841 is the 279221-st square number.

77964366841 is the 139611-st centered octagonal number.

It is an amenable number.

77964366841 is a deficient number, since it is larger than the sum of its proper divisors (279222).

77964366841 is an frugal number, since it uses more digits than its factorization.

77964366841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558442 (or 279221 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 61.

The spelling of 77964366841 in words is "seventy-seven billion, nine hundred sixty-four million, three hundred sixty-six thousand, eight hundred forty-one".