68156342777 has 2 divisors, whose sum is σ = 68156342778. Its totient is φ = 68156342776.

The previous prime is 68156342753. The next prime is 68156342797. The reversal of 68156342777 is 77724365186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68018726416 + 137616361 = 260804^2 + 11731^2 .

It is a cyclic number.

It is not a de Polignac number, because 68156342777 - 2⁶ = 68156342713 is a prime.

It is not a weakly prime, because it can be changed into another prime (68156342707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34078171388 + 34078171389.

It is an arithmetic number, because the mean of its divisors is an integer number (34078171389).

Almost surely, 2^68156342777 is an apocalyptic number.

It is an amenable number.

68156342777 is a deficient number, since it is larger than the sum of its proper divisors (1).

68156342777 is an equidigital number, since it uses as much as digits as its factorization.

68156342777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 56.

The spelling of 68156342777 in words is "sixty-eight billion, one hundred fifty-six million, three hundred forty-two thousand, seven hundred seventy-seven".