16505532444 has 12 divisors (see below), whose sum is σ = 38512909064. Its totient is φ = 5501844144.

The previous prime is 16505532437. The next prime is 16505532457. The reversal of 16505532444 is 44423550561.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×16505532444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687730507 + ... + 687730530.

Almost surely, 2^16505532444 is an apocalyptic number.

It is an amenable number.

16505532444 is an abundant number, since it is smaller than the sum of its proper divisors (22007376620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16505532444 is a wasteful number, since it uses less digits than its factorization.

16505532444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375461044 (or 1375461042 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 16505532444 in words is "sixteen billion, five hundred five million, five hundred thirty-two thousand, four hundred forty-four".