168751545921 has 12 divisors (see below), whose sum is σ = 278573980672. Its totient is φ = 96429454776.

The previous prime is 168751545841. The next prime is 168751545929. The reversal of 168751545921 is 129545157861.

168751545921 is a `hidden beast` number, since 1 + 6 + 8 + 7 + 5 + 1 + 545 + 92 + 1 = 666.

It is not a de Polignac number, because 168751545921 - 2¹³ = 168751537729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168751545929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1339297921 + ... + 1339298046.

Almost surely, 2^168751545921 is an apocalyptic number.

It is an amenable number.

168751545921 is a deficient number, since it is larger than the sum of its proper divisors (109822434751).

168751545921 is a wasteful number, since it uses less digits than its factorization.

168751545921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678595980 (or 2678595977 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 54.

The spelling of 168751545921 in words is "one hundred sixty-eight billion, seven hundred fifty-one million, five hundred forty-five thousand, nine hundred twenty-one".