20401640166105 has 48 divisors (see below), whose sum is σ = 39620285999424. Its totient is φ = 9624360954240.

The previous prime is 20401640166091. The next prime is 20401640166139. The reversal of 20401640166105 is 50166104610402.

20401640166105 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 1 + 640 + 1 + 6 + 6 + 1 + 0 + 5 = 666.

It is not a de Polignac number, because 20401640166105 - 2⁵ = 20401640166073 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20401640166105.

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 47 ways as a sum of consecutive naturals, for example, 556947019 + ... + 556983648.

It is an arithmetic number, because the mean of its divisors is an integer number (825422624988).

Almost surely, 2^{20401640166105} is an apocalyptic number.

It is an amenable number.

20401640166105 is a deficient number, since it is larger than the sum of its proper divisors (19218645833319).

20401640166105 is a wasteful number, since it uses less digits than its factorization.

20401640166105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113930726 (or 1113930723 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 20401640166105 its reverse (50166104610402), we get a palindrome (70567744776507).

The spelling of 20401640166105 in words is "twenty trillion, four hundred one billion, six hundred forty million, one hundred sixty-six thousand, one hundred five".