20666350068861 has 32 divisors (see below), whose sum is σ = 31847268510720. Its totient is φ = 11675975515776.

The previous prime is 20666350068841. The next prime is 20666350068877. The reversal of 20666350068861 is 16886005366602.

It is not a de Polignac number, because 20666350068861 - 2⁷ = 20666350068733 is a prime.

It is a super-2 number, since 2×20666350068861² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666350068841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32782150 + ... + 33406616.

It is an arithmetic number, because the mean of its divisors is an integer number (995227140960).

Almost surely, 2^{20666350068861} is an apocalyptic number.

20666350068861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20666350068861 is a deficient number, since it is larger than the sum of its proper divisors (11180918441859).

20666350068861 is a wasteful number, since it uses less digits than its factorization.

20666350068861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642273.

The product of its (nonzero) digits is 14929920, while the sum is 57.

The spelling of 20666350068861 in words is "twenty trillion, six hundred sixty-six billion, three hundred fifty million, sixty-eight thousand, eight hundred sixty-one".