16864139044 has 27 divisors (see below), whose sum is σ = 30578656017. Its totient is φ = 8137672368.

The previous prime is 16864139029. The next prime is 16864139053. The reversal of 16864139044 is 44093146861.

The square root of 16864139044 is 129862.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8843145444 + 8020993600 = 94038^2 + 89560^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16864138985 and 16864139003.

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 8 ways as a sum of consecutive naturals, for example, 7530877 + ... + 7533115.

Almost surely, 2^16864139044 is an apocalyptic number.

16864139044 is the 129862-nd square number.

It is an amenable number.

16864139044 is a deficient number, since it is larger than the sum of its proper divisors (13714516973).

16864139044 is an frugal number, since it uses more digits than its factorization.

16864139044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540 (or 2270 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 16864139044 in words is "sixteen billion, eight hundred sixty-four million, one hundred thirty-nine thousand, forty-four".