16645682736 has 280 divisors, whose sum is σ = 51679977984. Its totient is φ = 5173217280.

The previous prime is 16645682731. The next prime is 16645682741. The reversal of 16645682736 is 63728654661.

16645682736 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 568 + 2 + 73 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (16645682731) and next prime (16645682741).

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (8709120) is a multiple of the sum of its prime divisors (810).

It is not an unprimeable number, because it can be changed into a prime (16645682731) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 25182246 + ... + 25182906.

Almost surely, 2^16645682736 is an apocalyptic number.

16645682736 is a gapful number since it is divisible by the number (16) 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 16645682736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25839988992).

16645682736 is an abundant number, since it is smaller than the sum of its proper divisors (35034295248).

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

16645682736 is a wasteful number, since it uses less digits than its factorization.

16645682736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831 (or 810 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 16645682736 in words is "sixteen billion, six hundred forty-five million, six hundred eighty-two thousand, seven hundred thirty-six".