16044311509 has 4 divisors (see below), whose sum is σ = 16597563660. Its totient is φ = 15491059360.

The previous prime is 16044311483. The next prime is 16044311573. The reversal of 16044311509 is 90511344061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90511344061 = 67 ⋅1350915583.

It can be written as a sum of positive squares in 2 ways, for example, as 6971749009 + 9072562500 = 83497^2 + 95250^2 .

It is a cyclic number.

It is not a de Polignac number, because 16044311509 - 2⁵ = 16044311477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16044311909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276626032 + ... + 276626089.

It is an arithmetic number, because the mean of its divisors is an integer number (4149390915).

Almost surely, 2^16044311509 is an apocalyptic number.

It is an amenable number.

16044311509 is a deficient number, since it is larger than the sum of its proper divisors (553252151).

16044311509 is an equidigital number, since it uses as much as digits as its factorization.

16044311509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553252150.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 16044311509 in words is "sixteen billion, forty-four million, three hundred eleven thousand, five hundred nine".