16444015121 has 4 divisors (see below), whose sum is σ = 16485436212. Its totient is φ = 16402594032.

The previous prime is 16444015103. The next prime is 16444015141. The reversal of 16444015121 is 12151044461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9326730625 + 7117284496 = 96575^2 + 84364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16444015121 is a prime.

It is a super-3 number, since 3×16444015121³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16444015141) 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, 20709950 + ... + 20710743.

It is an arithmetic number, because the mean of its divisors is an integer number (4121359053).

Almost surely, 2^16444015121 is an apocalyptic number.

It is an amenable number.

16444015121 is a deficient number, since it is larger than the sum of its proper divisors (41421091).

16444015121 is an equidigital number, since it uses as much as digits as its factorization.

16444015121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41421090.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 16444015121 its reverse (12151044461), we get a palindrome (28595059582).

The spelling of 16444015121 in words is "sixteen billion, four hundred forty-four million, fifteen thousand, one hundred twenty-one".