9996664644 has 18 divisors (see below), whose sum is σ = 25269346830. Its totient is φ = 3332221536.

The previous prime is 9996664631. The next prime is 9996664681. The reversal of 9996664644 is 4464666999.

It can be written as a sum of positive squares in only one way, i.e., 9650704644 + 345960000 = 98238^2 + 18600^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

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 5 ways as a sum of consecutive naturals, for example, 138842529 + ... + 138842600.

Almost surely, 2^9996664644 is an apocalyptic number.

It is an amenable number.

9996664644 is an abundant number, since it is smaller than the sum of its proper divisors (15272682186).

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

9996664644 is a wasteful number, since it uses less digits than its factorization.

9996664644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277685139 (or 277685134 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 63.

The square root of 9996664644 is about 99983.3218291931. The cubic root of 9996664644 is about 2154.1951365077.

The spelling of 9996664644 in words is "nine billion, nine hundred ninety-six million, six hundred sixty-four thousand, six hundred forty-four".