16778257312 has 24 divisors (see below), whose sum is σ = 33035461956. Its totient is φ = 8388298752.

The previous prime is 16778257297. The next prime is 16778257351. The reversal of 16778257312 is 21375287761.

It is a happy number.

16778257312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15726163216 + 1052094096 = 125404^2 + 32436^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421168 + ... + 459280.

Almost surely, 2^16778257312 is an apocalyptic number.

It is an amenable number.

16778257312 is a deficient number, since it is larger than the sum of its proper divisors (16257204644).

16778257312 is a wasteful number, since it uses less digits than its factorization.

16778257312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51880 (or 51872 counting only the distinct ones).

The product of its digits is 987840, while the sum is 49.

The spelling of 16778257312 in words is "sixteen billion, seven hundred seventy-eight million, two hundred fifty-seven thousand, three hundred twelve".