168040388737 has 4 divisors (see below), whose sum is σ = 180966572500. Its totient is φ = 155114204976.

The previous prime is 168040388723. The next prime is 168040388749. The reversal of 168040388737 is 737883040861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69951786256 + 98088602481 = 264484^2 + 313191^2 .

It is a cyclic number.

It is not a de Polignac number, because 168040388737 - 2¹⁵ = 168040355969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168040388777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6463091862 + ... + 6463091887.

It is an arithmetic number, because the mean of its divisors is an integer number (45241643125).

Almost surely, 2^168040388737 is an apocalyptic number.

It is an amenable number.

168040388737 is a deficient number, since it is larger than the sum of its proper divisors (12926183763).

168040388737 is a wasteful number, since it uses less digits than its factorization.

168040388737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12926183762.

The product of its (nonzero) digits is 5419008, while the sum is 55.

The spelling of 168040388737 in words is "one hundred sixty-eight billion, forty million, three hundred eighty-eight thousand, seven hundred thirty-seven".