168353721801 has 24 divisors (see below), whose sum is σ = 248794098696. Its totient is φ = 109661160960.

The previous prime is 168353721787. The next prime is 168353721803. The reversal of 168353721801 is 108127353861.

It is a happy number.

168353721801 is a `hidden beast` number, since 16 + 8 + 3 + 537 + 21 + 80 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 100714196025 + 67639525776 = 317355^2 + 260076^2 .

It is not a de Polignac number, because 168353721801 - 2¹⁵ = 168353689033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168353721803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 617290 + ... + 847203.

It is an arithmetic number, because the mean of its divisors is an integer number (10366420779).

Almost surely, 2^168353721801 is an apocalyptic number.

It is an amenable number.

168353721801 is a deficient number, since it is larger than the sum of its proper divisors (80440376895).

168353721801 is a wasteful number, since it uses less digits than its factorization.

168353721801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464793 (or 1464790 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 168353721801 in words is "one hundred sixty-eight billion, three hundred fifty-three million, seven hundred twenty-one thousand, eight hundred one".