77911211977 has 4 divisors (see below), whose sum is σ = 81298656000. Its totient is φ = 74523767956.

The previous prime is 77911211927. The next prime is 77911211999.

77911211977 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77911211977 - 2¹⁹ = 77910687689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77911211927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1693721977 + ... + 1693722022.

It is an arithmetic number, because the mean of its divisors is an integer number (20324664000).

Almost surely, 2^77911211977 is an apocalyptic number.

It is an amenable number.

77911211977 is a deficient number, since it is larger than the sum of its proper divisors (3387444023).

77911211977 is a wasteful number, since it uses less digits than its factorization.

77911211977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387444022.

The product of its digits is 388962, while the sum is 52.

The spelling of 77911211977 in words is "seventy-seven billion, nine hundred eleven million, two hundred eleven thousand, nine hundred seventy-seven".