68784211057 has 2 divisors, whose sum is σ = 68784211058. Its totient is φ = 68784211056.

The previous prime is 68784211049. The next prime is 68784211061. The reversal of 68784211057 is 75011248786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56683991056 + 12100220001 = 238084^2 + 110001^2 .

It is a cyclic number.

It is not a de Polignac number, because 68784211057 - 2³ = 68784211049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68784211057.

It is not a weakly prime, because it can be changed into another prime (68784211007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34392105528 + 34392105529.

It is an arithmetic number, because the mean of its divisors is an integer number (34392105529).

Almost surely, 2^68784211057 is an apocalyptic number.

It is an amenable number.

68784211057 is a deficient number, since it is larger than the sum of its proper divisors (1).

68784211057 is an equidigital number, since it uses as much as digits as its factorization.

68784211057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 49.

It can be divided in two parts, 68784 and 211057, that added together give a 4-th power (279841 = 23⁴).

The spelling of 68784211057 in words is "sixty-eight billion, seven hundred eighty-four million, two hundred eleven thousand, fifty-seven".