68870187779 has 2 divisors, whose sum is σ = 68870187780. Its totient is φ = 68870187778.

The previous prime is 68870187773. The next prime is 68870187797. The reversal of 68870187779 is 97778107886.

Together with next prime (68870187797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68870187779 - 2³² = 64575220483 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (68870187773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34435093889 + 34435093890.

It is an arithmetic number, because the mean of its divisors is an integer number (34435093890).

Almost surely, 2^68870187779 is an apocalyptic number.

68870187779 is a deficient number, since it is larger than the sum of its proper divisors (1).

68870187779 is an equidigital number, since it uses as much as digits as its factorization.

68870187779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 66382848, while the sum is 68.

The spelling of 68870187779 in words is "sixty-eight billion, eight hundred seventy million, one hundred eighty-seven thousand, seven hundred seventy-nine".