16777243729 has 3 divisors (see below), whose sum is σ = 16777373257. Its totient is φ = 16777114202.

The previous prime is 16777243727. The next prime is 16777243733. The reversal of 16777243729 is 92734277761.

The square root of 16777243729 is 129527.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92734277761 = 4261 ⋅21763501.

It is not a de Polignac number, because 16777243729 - 2¹ = 16777243727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16777243729.

It is not an unprimeable number, because it can be changed into a prime (16777243723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 64764 + ... + 194290.

Almost surely, 2^16777243729 is an apocalyptic number.

16777243729 is the 129527-th square number.

16777243729 is the 64764-th centered octagonal number.

It is an amenable number.

16777243729 is a deficient number, since it is larger than the sum of its proper divisors (129528).

16777243729 is an frugal number, since it uses more digits than its factorization.

16777243729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259054 (or 129527 counting only the distinct ones).

The product of its digits is 6223392, while the sum is 55.

The spelling of 16777243729 in words is "sixteen billion, seven hundred seventy-seven million, two hundred forty-three thousand, seven hundred twenty-nine".