68556128237 has 2 divisors, whose sum is σ = 68556128238. Its totient is φ = 68556128236.

The previous prime is 68556128233. The next prime is 68556128257. The reversal of 68556128237 is 73282165586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57498764521 + 11057363716 = 239789^2 + 105154^2 .

It is a cyclic number.

It is not a de Polignac number, because 68556128237 - 2² = 68556128233 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68556128233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34278064118 + 34278064119.

It is an arithmetic number, because the mean of its divisors is an integer number (34278064119).

Almost surely, 2^68556128237 is an apocalyptic number.

It is an amenable number.

68556128237 is a deficient number, since it is larger than the sum of its proper divisors (1).

68556128237 is an equidigital number, since it uses as much as digits as its factorization.

68556128237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 53.

The spelling of 68556128237 in words is "sixty-eight billion, five hundred fifty-six million, one hundred twenty-eight thousand, two hundred thirty-seven".