16400312506 has 8 divisors (see below), whose sum is σ = 24601274100. Its totient is φ = 8199887808.

The previous prime is 16400312477. The next prime is 16400312549. The reversal of 16400312506 is 60521300461.

16400312506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13274496225 + 3125816281 = 115215^2 + 55909^2 .

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

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, 46351 + ... + 186946.

Almost surely, 2^16400312506 is an apocalyptic number.

16400312506 is a deficient number, since it is larger than the sum of its proper divisors (8200961594).

16400312506 is a wasteful number, since it uses less digits than its factorization.

16400312506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268448.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 16400312506 its reverse (60521300461), we get a palindrome (76921612967).

The spelling of 16400312506 in words is "sixteen billion, four hundred million, three hundred twelve thousand, five hundred six".