168342138728 has 16 divisors (see below), whose sum is σ = 315697728480. Its totient is φ = 84156077808.

The previous prime is 168342138703. The next prime is 168342138761. The reversal of 168342138728 is 827831243861.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 168342138728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826150 + ... + 1916117.

It is an arithmetic number, because the mean of its divisors is an integer number (19731108030).

Almost surely, 2^168342138728 is an apocalyptic number.

It is an amenable number.

168342138728 is a deficient number, since it is larger than the sum of its proper divisors (147355589752).

168342138728 is a wasteful number, since it uses less digits than its factorization.

168342138728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3747896 (or 3747892 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 53.

The spelling of 168342138728 in words is "one hundred sixty-eight billion, three hundred forty-two million, one hundred thirty-eight thousand, seven hundred twenty-eight".