16561304406 has 48 divisors (see below), whose sum is σ = 37289116800. Its totient is φ = 5306474880.

The previous prime is 16561304393. The next prime is 16561304423. The reversal of 16561304406 is 60440316561.

It is a happy number.

16561304406 is a `hidden beast` number, since 165 + 61 + 30 + 4 + 406 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16455 + ... + 182738.

It is an arithmetic number, because the mean of its divisors is an integer number (776856600).

Almost surely, 2^16561304406 is an apocalyptic number.

16561304406 is an abundant number, since it is smaller than the sum of its proper divisors (20727812394).

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

16561304406 is a wasteful number, since it uses less digits than its factorization.

16561304406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199381 (or 199378 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 16561304406 in words is "sixteen billion, five hundred sixty-one million, three hundred four thousand, four hundred six".