168651718394 has 16 divisors (see below), whose sum is σ = 256598019720. Its totient is φ = 83126337600.

The previous prime is 168651718369. The next prime is 168651718399. The reversal of 168651718394 is 493817156861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 167129704225 + 1522014169 = 408815^2 + 39013^2 .

It is not an unprimeable number, because it can be changed into a prime (168651718399) 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 in 7 ways as a sum of consecutive naturals, for example, 1776689 + ... + 1869204.

Almost surely, 2^168651718394 is an apocalyptic number.

168651718394 is a deficient number, since it is larger than the sum of its proper divisors (87946301326).

168651718394 is a wasteful number, since it uses less digits than its factorization.

168651718394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646225.

The product of its digits is 8709120, while the sum is 59.

The spelling of 168651718394 in words is "one hundred sixty-eight billion, six hundred fifty-one million, seven hundred eighteen thousand, three hundred ninety-four".