11555603664 has 160 divisors (see below), whose sum is σ = 34736812416. Its totient is φ = 3271311360.

The previous prime is 11555603659. The next prime is 11555603671. The reversal of 11555603664 is 46630655511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1225014 + ... + 1234410.

Almost surely, 2^11555603664 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 11555603664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17368406208).

11555603664 is an abundant number, since it is smaller than the sum of its proper divisors (23181208752).

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

11555603664 is a wasteful number, since it uses less digits than its factorization.

11555603664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9573 (or 9567 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 11555603664 in words is "eleven billion, five hundred fifty-five million, six hundred three thousand, six hundred sixty-four".