68651616138 has 32 divisors (see below), whose sum is σ = 158306645376. Its totient is φ = 19441164288.

The previous prime is 68651616113. The next prime is 68651616151. The reversal of 68651616138 is 83161615686.

It is a Curzon number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 7227831 + ... + 7237322.

It is an arithmetic number, because the mean of its divisors is an integer number (4947082668).

Almost surely, 2^68651616138 is an apocalyptic number.

68651616138 is an abundant number, since it is smaller than the sum of its proper divisors (89655029238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68651616138 is a wasteful number, since it uses less digits than its factorization.

68651616138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14465278.

The product of its digits is 1244160, while the sum is 51.

The spelling of 68651616138 in words is "sixty-eight billion, six hundred fifty-one million, six hundred sixteen thousand, one hundred thirty-eight".