16506501044 has 18 divisors (see below), whose sum is σ = 31751142402. Its totient is φ = 7502954800.

The previous prime is 16506501043. The next prime is 16506501071. The reversal of 16506501044 is 44010560561.

It can be written as a sum of positive squares in only one way, i.e., 12564168100 + 3942332944 = 112090^2 + 62788^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16506501044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506501041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17051687 + ... + 17052654.

Almost surely, 2^16506501044 is an apocalyptic number.

It is an amenable number.

16506501044 is a deficient number, since it is larger than the sum of its proper divisors (15244641358).

16506501044 is a wasteful number, since it uses less digits than its factorization.

16506501044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34104367 (or 34104354 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 16506501044 in words is "sixteen billion, five hundred six million, five hundred one thousand, forty-four".