16645825656 has 96 divisors (see below), whose sum is σ = 45576479520. Its totient is φ = 5488128000.

The previous prime is 16645825633. The next prime is 16645825687. The reversal of 16645825656 is 65652854661.

16645825656 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 582 + 5 + 6 + 56 = 666.

Its product of digits (10368000) is a multiple of the sum of its prime divisors (6750).

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, 2616976 + ... + 2623328.

It is an arithmetic number, because the mean of its divisors is an integer number (474754995).

Almost surely, 2^16645825656 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 16645825656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22788239760).

16645825656 is an abundant number, since it is smaller than the sum of its proper divisors (28930653864).

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

16645825656 is a wasteful number, since it uses less digits than its factorization.

16645825656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6757 (or 6750 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 54.

The spelling of 16645825656 in words is "sixteen billion, six hundred forty-five million, eight hundred twenty-five thousand, six hundred fifty-six".