77017774891 has 2 divisors, whose sum is σ = 77017774892. Its totient is φ = 77017774890.

The previous prime is 77017774781. The next prime is 77017774913. The reversal of 77017774891 is 19847771077.

It is a strong prime.

It is an emirp because it is prime and its reverse (19847771077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77017774891 is a prime.

It is not a weakly prime, because it can be changed into another prime (77017774391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38508887445 + 38508887446.

It is an arithmetic number, because the mean of its divisors is an integer number (38508887446).

Almost surely, 2^77017774891 is an apocalyptic number.

77017774891 is a deficient number, since it is larger than the sum of its proper divisors (1).

77017774891 is an equidigital number, since it uses as much as digits as its factorization.

77017774891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4840416, while the sum is 58.

The spelling of 77017774891 in words is "seventy-seven billion, seventeen million, seven hundred seventy-four thousand, eight hundred ninety-one".