11551646656 has 56 divisors (see below), whose sum is σ = 25079285376. Its totient is φ = 5235505920.

The previous prime is 11551646651. The next prime is 11551646663. The reversal of 11551646656 is 65664615511.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551646651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220645 + ... + 267931.

Almost surely, 2^11551646656 is an apocalyptic number.

11551646656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11551646656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12539642688).

11551646656 is an abundant number, since it is smaller than the sum of its proper divisors (13527638720).

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

11551646656 is a wasteful number, since it uses less digits than its factorization.

11551646656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47657 (or 47647 counting only the distinct ones).

The product of its digits is 648000, while the sum is 46.

The spelling of 11551646656 in words is "eleven billion, five hundred fifty-one million, six hundred forty-six thousand, six hundred fifty-six".