10020543454566 has 128 divisors (see below), whose sum is σ = 22668620083200. Its totient is φ = 3280636719360.

The previous prime is 10020543454547. The next prime is 10020543454567. The reversal of 10020543454566 is 66545434502001.

10020543454566 is a `hidden beast` number, since 1 + 0 + 0 + 2 + 0 + 5 + 4 + 34 + 54 + 566 = 666.

It is a super-2 number, since 2×10020543454566² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020543454567) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 500491636 + ... + 500511656.

It is an arithmetic number, because the mean of its divisors is an integer number (177098594400).

Almost surely, 2^{10020543454566} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10020543454566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11334310041600).

10020543454566 is an abundant number, since it is smaller than the sum of its proper divisors (12648076628634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10020543454566 is a wasteful number, since it uses less digits than its factorization.

10020543454566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20811 (or 20805 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

Adding to 10020543454566 its reverse (66545434502001), we get a palindrome (76565977956567).

The spelling of 10020543454566 in words is "ten trillion, twenty billion, five hundred forty-three million, four hundred fifty-four thousand, five hundred sixty-six".