16645576989 has 16 divisors (see below), whose sum is σ = 22320410112. Its totient is φ = 11034018048.

The previous prime is 16645576973. The next prime is 16645577017. The reversal of 16645576989 is 98967554661.

16645576989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16645576989 - 2⁴ = 16645576973 is a prime.

It is a super-2 number, since 2×16645576989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645576939) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 558817 + ... + 587849.

It is an arithmetic number, because the mean of its divisors is an integer number (1395025632).

Almost surely, 2^16645576989 is an apocalyptic number.

It is an amenable number.

16645576989 is a deficient number, since it is larger than the sum of its proper divisors (5674833123).

16645576989 is a wasteful number, since it uses less digits than its factorization.

16645576989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30116.

The product of its digits is 97977600, while the sum is 66.

The spelling of 16645576989 in words is "sixteen billion, six hundred forty-five million, five hundred seventy-six thousand, nine hundred eighty-nine".