168521894890 has 32 divisors (see below), whose sum is σ = 304540338960. Its totient is φ = 67142283264.

The previous prime is 168521894873. The next prime is 168521894917. The reversal of 168521894890 is 98498125861.

168521894890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 154017787401 + 14504107489 = 392451^2 + 120433^2 .

It is a super-2 number, since 2×168521894890² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3457006 + ... + 3505414.

Almost surely, 2^168521894890 is an apocalyptic number.

168521894890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168521894890 is a deficient number, since it is larger than the sum of its proper divisors (136018444070).

168521894890 is a wasteful number, since it uses less digits than its factorization.

168521894890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49786.

The product of its (nonzero) digits is 9953280, while the sum is 61.

The spelling of 168521894890 in words is "one hundred sixty-eight billion, five hundred twenty-one million, eight hundred ninety-four thousand, eight hundred ninety".