77630776129 has 3 divisors (see below), whose sum is σ = 77631054753. Its totient is φ = 77630497506.

The previous prime is 77630776087. The next prime is 77630776133. The reversal of 77630776129 is 92167703677.

The square root of 77630776129 is 278623.

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: 92167703677 = 7 ⋅13166814811.

It is a de Polignac number, because none of the positive numbers 2^k-77630776129 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 77630776129.

It is not an unprimeable number, because it can be changed into a prime (77630746129) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 139312 + ... + 417934.

It is an arithmetic number, because the mean of its divisors is an integer number (25877018251).

Almost surely, 2^77630776129 is an apocalyptic number.

77630776129 is the 278623-rd square number.

77630776129 is the 139312-nd centered octagonal number.

It is an amenable number.

77630776129 is a deficient number, since it is larger than the sum of its proper divisors (278624).

77630776129 is an frugal number, since it uses more digits than its factorization.

77630776129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557246 (or 278623 counting only the distinct ones).

The product of its (nonzero) digits is 4667544, while the sum is 55.

The spelling of 77630776129 in words is "seventy-seven billion, six hundred thirty million, seven hundred seventy-six thousand, one hundred twenty-nine".