16780781952 has 192 divisors, whose sum is σ = 53165970000. Its totient is φ = 5038018560.

The previous prime is 16780781933. The next prime is 16780781959. The reversal of 16780781952 is 25918708761.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16780781959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1375174 + ... + 1387322.

Almost surely, 2^16780781952 is an apocalyptic number.

16780781952 is a gapful number since it is divisible by the number (12) 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 16780781952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26582985000).

16780781952 is an abundant number, since it is smaller than the sum of its proper divisors (36385188048).

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

16780781952 is a wasteful number, since it uses less digits than its factorization.

16780781952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12289 (or 12274 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 54.

The spelling of 16780781952 in words is "sixteen billion, seven hundred eighty million, seven hundred eighty-one thousand, nine hundred fifty-two".