20556166612105 has 8 divisors (see below), whose sum is σ = 25085491459200. Its totient is φ = 16166205606576.

The previous prime is 20556166612103. The next prime is 20556166612127. The reversal of 20556166612105 is 50121666165502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20556166612105 - 2¹ = 20556166612103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20556166612103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34840960065 + ... + 34840960654.

It is an arithmetic number, because the mean of its divisors is an integer number (3135686432400).

Almost surely, 2^{20556166612105} is an apocalyptic number.

It is an amenable number.

20556166612105 is a deficient number, since it is larger than the sum of its proper divisors (4529324847095).

20556166612105 is an equidigital number, since it uses as much as digits as its factorization.

20556166612105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69681920783.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 20556166612105 in words is "twenty trillion, five hundred fifty-six billion, one hundred sixty-six million, six hundred twelve thousand, one hundred five".