68781565138 has 64 divisors (see below), whose sum is σ = 121816203264. Its totient is φ = 28715400000.

The previous prime is 68781565091. The next prime is 68781565183. The reversal of 68781565138 is 83156518786.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91586263 + ... + 91587013.

It is an arithmetic number, because the mean of its divisors is an integer number (1903378176).

Almost surely, 2^68781565138 is an apocalyptic number.

68781565138 is a deficient number, since it is larger than the sum of its proper divisors (53034638126).

68781565138 is a wasteful number, since it uses less digits than its factorization.

68781565138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951.

The product of its digits is 9676800, while the sum is 58.

The spelling of 68781565138 in words is "sixty-eight billion, seven hundred eighty-one million, five hundred sixty-five thousand, one hundred thirty-eight".