68709577778 has 4 divisors (see below), whose sum is σ = 103064366670. Its totient is φ = 34354788888.

The previous prime is 68709577771. The next prime is 68709577799. The reversal of 68709577778 is 87777590786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87777590786 = 2 ⋅43888795393.

It can be written as a sum of positive squares in only one way, i.e., 53076326689 + 15633251089 = 230383^2 + 125033^2 .

It is not an unprimeable number, because it can be changed into a prime (68709577771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17177394443 + ... + 17177394446.

Almost surely, 2^68709577778 is an apocalyptic number.

68709577778 is a deficient number, since it is larger than the sum of its proper divisors (34354788892).

68709577778 is a wasteful number, since it uses less digits than its factorization.

68709577778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34354788891.

The product of its (nonzero) digits is 290424960, while the sum is 71.

The spelling of 68709577778 in words is "sixty-eight billion, seven hundred nine million, five hundred seventy-seven thousand, seven hundred seventy-eight".