16156443664 has 45 divisors (see below), whose sum is σ = 32091444063. Its totient is φ = 7879679136.

The previous prime is 16156443649. The next prime is 16156443727. The reversal of 16156443664 is 46634465161.

The square root of 16156443664 is 127108.

It is a perfect power (a square), and thus also a powerful number.

16156443664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16156443664² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21862207 + ... + 21862945.

Almost surely, 2^16156443664 is an apocalyptic number.

16156443664 is the 127108-th square number.

It is an amenable number.

16156443664 is a deficient number, since it is larger than the sum of its proper divisors (15935000399).

16156443664 is an frugal number, since it uses more digits than its factorization.

16156443664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 784 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 46.

The spelling of 16156443664 in words is "sixteen billion, one hundred fifty-six million, four hundred forty-three thousand, six hundred sixty-four".