20664464622066 has 36 divisors (see below), whose sum is σ = 46492683236142. Its totient is φ = 6888154869648.

The previous prime is 20664464622037. The next prime is 20664464622077. The reversal of 20664464622066 is 66022646446602.

20664464622066 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 4 + 4 + 6 + 4 + 622 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19709417741841 + 955046880225 = 4439529^2 + 977265^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 787384555 + ... + 787410798.

Almost surely, 2^{20664464622066} is an apocalyptic number.

20664464622066 is an abundant number, since it is smaller than the sum of its proper divisors (25828218614076).

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

20664464622066 is an frugal number, since it uses more digits than its factorization.

20664464622066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574795379 (or 1574795358 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 54.

The spelling of 20664464622066 in words is "twenty trillion, six hundred sixty-four billion, four hundred sixty-four million, six hundred twenty-two thousand, sixty-six".