77818884052057 has 2 divisors, whose sum is σ = 77818884052058. Its totient is φ = 77818884052056.

The previous prime is 77818884052033. The next prime is 77818884052067. The reversal of 77818884052057 is 75025048881877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74377929541696 + 3440954510361 = 8624264^2 + 1854981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77818884052057 is a prime.

It is not a weakly prime, because it can be changed into another prime (77818884052067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38909442026028 + 38909442026029.

It is an arithmetic number, because the mean of its divisors is an integer number (38909442026029).

Almost surely, 2^{77818884052057} is an apocalyptic number.

It is an amenable number.

77818884052057 is a deficient number, since it is larger than the sum of its proper divisors (1).

77818884052057 is an equidigital number, since it uses as much as digits as its factorization.

77818884052057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280985600, while the sum is 70.

The spelling of 77818884052057 in words is "seventy-seven trillion, eight hundred eighteen billion, eight hundred eighty-four million, fifty-two thousand, fifty-seven".