168721035460643 has 16 divisors (see below), whose sum is σ = 176084307095040. Its totient is φ = 161360064300864.

The previous prime is 168721035460633. The next prime is 168721035460669. The reversal of 168721035460643 is 346064530127861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 168721035460643 - 2²⁰ = 168721034412067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168721035460633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6813420380 + ... + 6813445142.

It is an arithmetic number, because the mean of its divisors is an integer number (11005269193440).

Almost surely, 2^{168721035460643} is an apocalyptic number.

168721035460643 is a deficient number, since it is larger than the sum of its proper divisors (7363271634397).

168721035460643 is a wasteful number, since it uses less digits than its factorization.

168721035460643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59218.

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 168721035460643 in words is "one hundred sixty-eight trillion, seven hundred twenty-one billion, thirty-five million, four hundred sixty thousand, six hundred forty-three".