20664666242016 has 48 divisors (see below), whose sum is σ = 54751709182464. Its totient is φ = 6823846169984.

The previous prime is 20664666241997. The next prime is 20664666242023. The reversal of 20664666242016 is 61024266646602.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20664666242016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005863280 + ... + 1005883823.

It is an arithmetic number, because the mean of its divisors is an integer number (1140660607968).

Almost surely, 2^{20664666242016} is an apocalyptic number.

It is an amenable number.

20664666242016 is an abundant number, since it is smaller than the sum of its proper divisors (34087042940448).

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

20664666242016 is a wasteful number, since it uses less digits than its factorization.

20664666242016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011747223 (or 2011747215 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 51.

The spelling of 20664666242016 in words is "twenty trillion, six hundred sixty-four billion, six hundred sixty-six million, two hundred forty-two thousand, sixteen".