16644406286516 has 12 divisors (see below), whose sum is σ = 29129755294500. Its totient is φ = 8321619059520.

The previous prime is 16644406286507. The next prime is 16644406286579. The reversal of 16644406286516 is 61568260444661.

It can be written as a sum of positive squares in 2 ways, for example, as 13807021008400 + 2837385278116 = 3715780^2 + 1684454^2 .

It is a super-3 number, since 3×16644406286516³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 145956815 + ... + 146070806.

It is an arithmetic number, because the mean of its divisors is an integer number (2427479607875).

Almost surely, 2^{16644406286516} is an apocalyptic number.

It is an amenable number.

16644406286516 is a deficient number, since it is larger than the sum of its proper divisors (12485349007984).

16644406286516 is a wasteful number, since it uses less digits than its factorization.

16644406286516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292041874 (or 292041872 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 59.

The spelling of 16644406286516 in words is "sixteen trillion, six hundred forty-four billion, four hundred six million, two hundred eighty-six thousand, five hundred sixteen".