20663655543 has 12 divisors (see below), whose sum is σ = 29848825968. Its totient is φ = 13775159520.

The previous prime is 20663655539. The next prime is 20663655557. The reversal of 20663655543 is 34555636602.

20663655543 is a `hidden beast` number, since 2 + 0 + 6 + 636 + 5 + 5 + 5 + 4 + 3 = 666.

It is not a de Polignac number, because 20663655543 - 2² = 20663655539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663655043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269446 + ... + 337532.

It is an arithmetic number, because the mean of its divisors is an integer number (2487402164).

Almost surely, 2^20663655543 is an apocalyptic number.

20663655543 is a deficient number, since it is larger than the sum of its proper divisors (9185170425).

20663655543 is a wasteful number, since it uses less digits than its factorization.

20663655543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101814 (or 101811 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 45.

The spelling of 20663655543 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred forty-three".