20663655266 has 8 divisors (see below), whose sum is σ = 31368922704. Its totient is φ = 10207347700.

The previous prime is 20663655217. The next prime is 20663655281. The reversal of 20663655266 is 66255636602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20663655266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62239760 + ... + 62240091.

It is an arithmetic number, because the mean of its divisors is an integer number (3921115338).

Almost surely, 2^20663655266 is an apocalyptic number.

20663655266 is a deficient number, since it is larger than the sum of its proper divisors (10705267438).

20663655266 is a wasteful number, since it uses less digits than its factorization.

20663655266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124479936.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 20663655266 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, two hundred sixty-six".