20616064456566 has 8 divisors (see below), whose sum is σ = 41232128913144. Its totient is φ = 6872021485520.

The previous prime is 20616064456543. The next prime is 20616064456613. The reversal of 20616064456566 is 66565446061602.

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

20616064456566 is an admirable number.

It is a super-2 number, since 2×20616064456566² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718005371375 + ... + 1718005371386.

It is an arithmetic number, because the mean of its divisors is an integer number (5154016114143).

Almost surely, 2^{20616064456566} is an apocalyptic number.

20616064456566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20616064456566 is a wasteful number, since it uses less digits than its factorization.

20616064456566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436010742766.

The product of its (nonzero) digits is 37324800, while the sum is 57.

The spelling of 20616064456566 in words is "twenty trillion, six hundred sixteen billion, sixty-four million, four hundred fifty-six thousand, five hundred sixty-six".