20664354663 has 16 divisors (see below), whose sum is σ = 30659105760. Its totient is φ = 13755875328.

The previous prime is 20664354631. The next prime is 20664354677. The reversal of 20664354663 is 36645346602.

20664354663 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 43 + 546 + 63 = 666.

It is not a de Polignac number, because 20664354663 - 2⁵ = 20664354631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664356663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 546970 + ... + 583527.

It is an arithmetic number, because the mean of its divisors is an integer number (1916194110).

Almost surely, 2^20664354663 is an apocalyptic number.

20664354663 is a deficient number, since it is larger than the sum of its proper divisors (9994751097).

20664354663 is a wasteful number, since it uses less digits than its factorization.

20664354663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131183 (or 1131177 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 45.

The spelling of 20664354663 in words is "twenty billion, six hundred sixty-four million, three hundred fifty-four thousand, six hundred sixty-three".