16993656640 has 112 divisors (see below), whose sum is σ = 42194073600. Its totient is φ = 6510938112.

The previous prime is 16993656623. The next prime is 16993656649. The reversal of 16993656640 is 4665639961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16993656649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1171351 + ... + 1185769.

It is an arithmetic number, because the mean of its divisors is an integer number (376732800).

Almost surely, 2^16993656640 is an apocalyptic number.

16993656640 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 16993656640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21097036800).

16993656640 is an abundant number, since it is smaller than the sum of its proper divisors (25200416960).

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

16993656640 is a wasteful number, since it uses less digits than its factorization.

16993656640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14592 (or 14582 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 55.

It can be divided in two parts, 169936 and 56640, that added together give a square (226576 = 476²).

The spelling of 16993656640 in words is "sixteen billion, nine hundred ninety-three million, six hundred fifty-six thousand, six hundred forty".