20146106405561 has 8 divisors (see below), whose sum is σ = 21022080799104. Its totient is φ = 19270136739040.

The previous prime is 20146106405527. The next prime is 20146106405591. The reversal of 20146106405561 is 16550460164102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20146106405561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20146106405591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9633356 + ... + 11536626.

It is an arithmetic number, because the mean of its divisors is an integer number (2627760099888).

Almost surely, 2^{20146106405561} is an apocalyptic number.

It is an amenable number.

20146106405561 is a deficient number, since it is larger than the sum of its proper divisors (875974393543).

20146106405561 is a wasteful number, since it uses less digits than its factorization.

20146106405561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363511.

The product of its (nonzero) digits is 172800, while the sum is 41.

Adding to 20146106405561 its reverse (16550460164102), we get a palindrome (36696566569663).

The spelling of 20146106405561 in words is "twenty trillion, one hundred forty-six billion, one hundred six million, four hundred five thousand, five hundred sixty-one".