9001644551172 has 240 divisors, whose sum is σ = 28998433537920. Its totient is φ = 2371119257088.

The previous prime is 9001644551089. The next prime is 9001644551203. The reversal of 9001644551172 is 2711554461009.

9001644551172 is a `hidden beast` number, since 9 + 0 + 0 + 1 + 64 + 4 + 5 + 511 + 72 = 666.

9001644551172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 23663863 + ... + 24041249.

It is an arithmetic number, because the mean of its divisors is an integer number (120826806408).

Almost surely, 2^{9001644551172} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9001644551172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14499216768960).

9001644551172 is an abundant number, since it is smaller than the sum of its proper divisors (19996788986748).

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

9001644551172 is a wasteful number, since it uses less digits than its factorization.

9001644551172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378232 (or 378221 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 9001644551172 in words is "nine trillion, one billion, six hundred forty-four million, five hundred fifty-one thousand, one hundred seventy-two".