20566157216256 has 160 divisors (see below), whose sum is σ = 60884151736320. Its totient is φ = 6854608945152.

The previous prime is 20566157216221. The next prime is 20566157216279. The reversal of 20566157216256 is 65261275166502.

20566157216256 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 6 + 1 + 5 + 7 + 2 + 1 + 625 + 6 = 666.

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 15 ways as a sum of consecutive naturals, for example, 129078016 + ... + 129237248.

It is an arithmetic number, because the mean of its divisors is an integer number (380525948352).

Almost surely, 2^{20566157216256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20566157216256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30442075868160).

20566157216256 is an abundant number, since it is smaller than the sum of its proper divisors (40317994520064).

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

20566157216256 is an equidigital number, since it uses as much as digits as its factorization.

20566157216256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168603 (or 168581 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 20566157216256 in words is "twenty trillion, five hundred sixty-six billion, one hundred fifty-seven million, two hundred sixteen thousand, two hundred fifty-six".