168228909822861 has 24 divisors (see below), whose sum is σ = 248950477339200. Its totient is φ = 109405572993600.

The previous prime is 168228909822851. The next prime is 168228909822991.

168228909822861 is a `hidden beast` number, since 1 + 6 + 8 + 228 + 90 + 98 + 228 + 6 + 1 = 666.

168228909822861 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 168228909822861 - 2³⁷ = 168091470869389 is a prime.

It is a super-2 number, since 2×168228909822861² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168228909822861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168228909822851) 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, 20690511 + ... + 27650588.

It is an arithmetic number, because the mean of its divisors is an integer number (10372936555800).

Almost surely, 2^{168228909822861} is an apocalyptic number.

It is an amenable number.

168228909822861 is a deficient number, since it is larger than the sum of its proper divisors (80721567516339).

168228909822861 is a wasteful number, since it uses less digits than its factorization.

168228909822861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48350577 (or 48350574 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 72.

The spelling of 168228909822861 in words is "one hundred sixty-eight trillion, two hundred twenty-eight billion, nine hundred nine million, eight hundred twenty-two thousand, eight hundred sixty-one".