16940399445 has 48 divisors (see below), whose sum is σ = 32162747760. Its totient is φ = 8210184192.

The previous prime is 16940399419. The next prime is 16940399447. The reversal of 16940399445 is 54499304961.

It is a happy number.

16940399445 is a `hidden beast` number, since 169 + 4 + 0 + 39 + 9 + 445 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 493106436 + 16447293009 = 22206^2 + 128247^2 .

It is not a de Polignac number, because 16940399445 - 2⁹ = 16940398933 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16940399391 and 16940399400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16940399447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 359614 + ... + 403983.

It is an arithmetic number, because the mean of its divisors is an integer number (670057245).

Almost surely, 2^16940399445 is an apocalyptic number.

16940399445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16940399445 is a deficient number, since it is larger than the sum of its proper divisors (15222348315).

16940399445 is a wasteful number, since it uses less digits than its factorization.

16940399445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763654 (or 763651 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 16940399445 in words is "sixteen billion, nine hundred forty million, three hundred ninety-nine thousand, four hundred forty-five".