16565662560 has 144 divisors (see below), whose sum is σ = 52786850256. Its totient is φ = 4366872576.

The previous prime is 16565662543. The next prime is 16565662571. The reversal of 16565662560 is 6526656561.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3799902 + ... + 3804258.

It is an arithmetic number, because the mean of its divisors is an integer number (366575349).

Almost surely, 2^16565662560 is an apocalyptic number.

16565662560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16565662560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26393425128).

16565662560 is an abundant number, since it is smaller than the sum of its proper divisors (36221187696).

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

16565662560 is an equidigital number, since it uses as much as digits as its factorization.

16565662560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553 (or 4456 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 16565662560 in words is "sixteen billion, five hundred sixty-five million, six hundred sixty-two thousand, five hundred sixty".