16393209444 has 18 divisors (see below), whose sum is σ = 41438390630. Its totient is φ = 5464403136.

The previous prime is 16393209439. The next prime is 16393209517. The reversal of 16393209444 is 44490239361.

16393209444 is a `hidden beast` number, since 1 + 639 + 3 + 2 + 0 + 9 + 4 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13239263844 + 3153945600 = 115062^2 + 56160^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 16393209444.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 227683429 + ... + 227683500.

Almost surely, 2^16393209444 is an apocalyptic number.

It is an amenable number.

16393209444 is an abundant number, since it is smaller than the sum of its proper divisors (25045181186).

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

16393209444 is a wasteful number, since it uses less digits than its factorization.

16393209444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455366939 (or 455366934 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 16393209444 in words is "sixteen billion, three hundred ninety-three million, two hundred nine thousand, four hundred forty-four".