16561231406 has 8 divisors (see below), whose sum is σ = 24842643600. Its totient is φ = 8280350208.

The previous prime is 16561231399. The next prime is 16561231457. The reversal of 16561231406 is 60413216561.

16561231406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 42506 + ... + 186893.

It is an arithmetic number, because the mean of its divisors is an integer number (3105330450).

Almost surely, 2^16561231406 is an apocalyptic number.

16561231406 is a deficient number, since it is larger than the sum of its proper divisors (8281412194).

16561231406 is a wasteful number, since it uses less digits than its factorization.

16561231406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265498.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 16561231406 its reverse (60413216561), we get a palindrome (76974447967).

The spelling of 16561231406 in words is "sixteen billion, five hundred sixty-one million, two hundred thirty-one thousand, four hundred six".