16393439787880 has 64 divisors (see below), whose sum is σ = 37101048042960. Its totient is φ = 6519015272448.

The previous prime is 16393439787877. The next prime is 16393439787887. The reversal of 16393439787880 is 8878793439361.

It can be written as a sum of positive squares in 8 ways, for example, as 8827518400996 + 7565921386884 = 2971114^2 + 2750622^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16393439787797 and 16393439787806.

It is not an unprimeable number, because it can be changed into a prime (16393439787887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109074064 + ... + 109224256.

Almost surely, 2^{16393439787880} is an apocalyptic number.

16393439787880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16393439787880 is an abundant number, since it is smaller than the sum of its proper divisors (20707608255080).

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

16393439787880 is a wasteful number, since it uses less digits than its factorization.

16393439787880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166150 (or 166146 counting only the distinct ones).

The product of its (nonzero) digits is 1316818944, while the sum is 76.

The spelling of 16393439787880 in words is "sixteen trillion, three hundred ninety-three billion, four hundred thirty-nine million, seven hundred eighty-seven thousand, eight hundred eighty".