68156288693 has 2 divisors, whose sum is σ = 68156288694. Its totient is φ = 68156288692.

The previous prime is 68156288689. The next prime is 68156288731. The reversal of 68156288693 is 39688265186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39013360324 + 29142928369 = 197518^2 + 170713^2 .

It is a cyclic number.

It is not a de Polignac number, because 68156288693 - 2² = 68156288689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68156288093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34078144346 + 34078144347.

It is an arithmetic number, because the mean of its divisors is an integer number (34078144347).

Almost surely, 2^68156288693 is an apocalyptic number.

It is an amenable number.

68156288693 is a deficient number, since it is larger than the sum of its proper divisors (1).

68156288693 is an equidigital number, since it uses as much as digits as its factorization.

68156288693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 62.

The spelling of 68156288693 in words is "sixty-eight billion, one hundred fifty-six million, two hundred eighty-eight thousand, six hundred ninety-three".