168061835890 has 64 divisors (see below), whose sum is σ = 330412201056. Its totient is φ = 61172416512.

The previous prime is 168061835863. The next prime is 168061835891. The reversal of 168061835890 is 98538160861.

It can be written as a sum of positive squares in 16 ways, for example, as 197093521 + 167864742369 = 14039^2 + 409713^2 .

It is not an unprimeable number, because it can be changed into a prime (168061835891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27489474 + ... + 27495586.

Almost surely, 2^168061835890 is an apocalyptic number.

168061835890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168061835890 is a deficient number, since it is larger than the sum of its proper divisors (162350365166).

168061835890 is a wasteful number, since it uses less digits than its factorization.

168061835890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9103.

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 168061835890 in words is "one hundred sixty-eight billion, sixty-one million, eight hundred thirty-five thousand, eight hundred ninety".