20557683165789 has 64 divisors (see below), whose sum is σ = 37973084590080. Its totient is φ = 10678701821760.

The previous prime is 20557683165787. The next prime is 20557683165793. The reversal of 20557683165789 is 98756138675502.

20557683165789 is a `hidden beast` number, since 2 + 0 + 557 + 6 + 8 + 3 + 1 + 65 + 7 + 8 + 9 = 666.

It is not a de Polignac number, because 20557683165789 - 2¹ = 20557683165787 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557683165787) 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 63 ways as a sum of consecutive naturals, for example, 37057272 + ... + 37607934.

It is an arithmetic number, because the mean of its divisors is an integer number (593329446720).

Almost surely, 2^{20557683165789} is an apocalyptic number.

It is an amenable number.

20557683165789 is a deficient number, since it is larger than the sum of its proper divisors (17415401424291).

20557683165789 is a wasteful number, since it uses less digits than its factorization.

20557683165789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568647 (or 568641 counting only the distinct ones).

The product of its (nonzero) digits is 762048000, while the sum is 72.

The spelling of 20557683165789 in words is "twenty trillion, five hundred fifty-seven billion, six hundred eighty-three million, one hundred sixty-five thousand, seven hundred eighty-nine".