9971117644 has 12 divisors (see below), whose sum is σ = 18475894584. Its totient is φ = 4692290624.

The previous prime is 9971117623. The next prime is 9971117671. The reversal of 9971117644 is 4467111799.

It is a happy number.

It is a super-2 number, since 2×9971117644² (a number of 21 digits) contains 22 as substring.

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, 73316974 + ... + 73317109.

It is an arithmetic number, because the mean of its divisors is an integer number (1539657882).

Almost surely, 2^9971117644 is an apocalyptic number.

It is an amenable number.

9971117644 is a deficient number, since it is larger than the sum of its proper divisors (8504776940).

9971117644 is a wasteful number, since it uses less digits than its factorization.

9971117644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146634104 (or 146634102 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 9971117644 is about 99855.4837953329. The cubic root of 9971117644 is about 2152.3585182662.

The spelling of 9971117644 in words is "nine billion, nine hundred seventy-one million, one hundred seventeen thousand, six hundred forty-four".