9809945644 has 12 divisors (see below), whose sum is σ = 17175088000. Its totient is φ = 4902777648.

The previous prime is 9809945617. The next prime is 9809945683. The reversal of 9809945644 is 4465499089.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538719 + ... + 556630.

Almost surely, 2^9809945644 is an apocalyptic number.

It is an amenable number.

9809945644 is a deficient number, since it is larger than the sum of its proper divisors (7365142356).

9809945644 is a wasteful number, since it uses less digits than its factorization.

9809945644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097592 (or 1097590 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The square root of 9809945644 is about 99045.1697156403. The cubic root of 9809945644 is about 2140.6986425341.

The spelling of 9809945644 in words is "nine billion, eight hundred nine million, nine hundred forty-five thousand, six hundred forty-four".