11509856656 has 15 divisors (see below), whose sum is σ = 22301178753. Its totient is φ = 5754713760.

The previous prime is 11509856653. The next prime is 11509856663. The reversal of 11509856656 is 65665890511.

The square root of 11509856656 is 107284.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10016807056 + 1493049600 = 100084^2 + 38640^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11509856653) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 415726 + ... + 442546.

Almost surely, 2^11509856656 is an apocalyptic number.

11509856656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

11509856656 is the 107284-th square number.

It is an amenable number.

11509856656 is a deficient number, since it is larger than the sum of its proper divisors (10791322097).

11509856656 is an frugal number, since it uses more digits than its factorization.

11509856656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53650 (or 26823 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 11509856656 in words is "eleven billion, five hundred nine million, eight hundred fifty-six thousand, six hundred fifty-six".