16778539024 has 135 divisors (see below), whose sum is σ = 36657740343. Its totient is φ = 7436173056.

The previous prime is 16778538967. The next prime is 16778539033. The reversal of 16778539024 is 42093587761.

The square root of 16778539024 is 129532.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 435473424 + 16343065600 = 20868^2 + 127840^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 316576182 + ... + 316576234.

It is a 1-persistent number, because it is pandigital, but 2⋅16778539024 = 33557078048 is not.

Almost surely, 2^16778539024 is an apocalyptic number.

16778539024 is the 129532-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16778539024

16778539024 is an abundant number, since it is smaller than the sum of its proper divisors (19879201319).

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

16778539024 is an equidigital number, since it uses as much as digits as its factorization.

16778539024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 16778539024 in words is "sixteen billion, seven hundred seventy-eight million, five hundred thirty-nine thousand, twenty-four".