20664543163 has 4 divisors (see below), whose sum is σ = 22543138008. Its totient is φ = 18785948320.

The previous prime is 20664543161. The next prime is 20664543169. The reversal of 20664543163 is 36134546602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20664543163 - 2¹ = 20664543161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20664543161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939297406 + ... + 939297427.

It is an arithmetic number, because the mean of its divisors is an integer number (5635784502).

Almost surely, 2^20664543163 is an apocalyptic number.

20664543163 is a deficient number, since it is larger than the sum of its proper divisors (1878594845).

20664543163 is a wasteful number, since it uses less digits than its factorization.

20664543163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878594844.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 20664543163 in words is "twenty billion, six hundred sixty-four million, five hundred forty-three thousand, one hundred sixty-three".