16644502159 has 4 divisors (see below), whose sum is σ = 16644761440. Its totient is φ = 16644242880.

The previous prime is 16644502157. The next prime is 16644502169. The reversal of 16644502159 is 95120544661.

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: 95120544661 = 661 ⋅143904001.

It is a cyclic number.

It is not a de Polignac number, because 16644502159 - 2¹ = 16644502157 is a prime.

It is a super-2 number, since 2×16644502159² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644502157) 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, 45727 + ... + 188095.

It is an arithmetic number, because the mean of its divisors is an integer number (4161190360).

Almost surely, 2^16644502159 is an apocalyptic number.

16644502159 is a deficient number, since it is larger than the sum of its proper divisors (259281).

16644502159 is a wasteful number, since it uses less digits than its factorization.

16644502159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259280.

The product of its (nonzero) digits is 259200, while the sum is 43.

It can be divided in two parts, 16644502 and 159, that added together give a palindrome (16644661).

The spelling of 16644502159 in words is "sixteen billion, six hundred forty-four million, five hundred two thousand, one hundred fifty-nine".