168643621695 has 16 divisors (see below), whose sum is σ = 270011289600. Its totient is φ = 89882766624.

The previous prime is 168643621687. The next prime is 168643621759. The reversal of 168643621695 is 596126346861.

It is not a de Polignac number, because 168643621695 - 2³ = 168643621687 is a prime.

It is a super-2 number, since 2×168643621695² (a number of 23 digits) contains 22 as substring.

It is a congruent 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, 3758095 + ... + 3802704.

It is an arithmetic number, because the mean of its divisors is an integer number (16875705600).

Almost surely, 2^168643621695 is an apocalyptic number.

168643621695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

168643621695 is a deficient number, since it is larger than the sum of its proper divisors (101367667905).

168643621695 is a wasteful number, since it uses less digits than its factorization.

168643621695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562294.

The product of its digits is 11197440, while the sum is 57.

The spelling of 168643621695 in words is "one hundred sixty-eight billion, six hundred forty-three million, six hundred twenty-one thousand, six hundred ninety-five".