77216644853 has 2 divisors, whose sum is σ = 77216644854. Its totient is φ = 77216644852.

The previous prime is 77216644829. The next prime is 77216644891. The reversal of 77216644853 is 35844661277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76932452689 + 284192164 = 277367^2 + 16858^2 .

It is a cyclic number.

It is not a de Polignac number, because 77216644853 - 2⁸ = 77216644597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77216644795 and 77216644804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77216644823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38608322426 + 38608322427.

It is an arithmetic number, because the mean of its divisors is an integer number (38608322427).

Almost surely, 2^77216644853 is an apocalyptic number.

It is an amenable number.

77216644853 is a deficient number, since it is larger than the sum of its proper divisors (1).

77216644853 is an equidigital number, since it uses as much as digits as its factorization.

77216644853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 53.

The spelling of 77216644853 in words is "seventy-seven billion, two hundred sixteen million, six hundred forty-four thousand, eight hundred fifty-three".