168868421781 has 8 divisors (see below), whose sum is σ = 226141118880. Its totient is φ = 112087336272.

The previous prime is 168868421779. The next prime is 168868421791. The reversal of 168868421781 is 187124868861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 168868421781 - 2¹ = 168868421779 is a prime.

It is a super-2 number, since 2×168868421781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168868421791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122902095 + ... + 122903468.

It is an arithmetic number, because the mean of its divisors is an integer number (28267639860).

Almost surely, 2^168868421781 is an apocalyptic number.

It is an amenable number.

168868421781 is a deficient number, since it is larger than the sum of its proper divisors (57272697099).

168868421781 is a wasteful number, since it uses less digits than its factorization.

168868421781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245805795.

The product of its digits is 8257536, while the sum is 60.

The spelling of 168868421781 in words is "one hundred sixty-eight billion, eight hundred sixty-eight million, four hundred twenty-one thousand, seven hundred eighty-one".