11656520011 has 4 divisors (see below), whose sum is σ = 11663406832. Its totient is φ = 11649633192.

The previous prime is 11656520009. The next prime is 11656520021. The reversal of 11656520011 is 11002565611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11002565611 = 4967 ⋅2215133.

It is a cyclic number.

It is not a de Polignac number, because 11656520011 - 2¹ = 11656520009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11656520021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3440871 + ... + 3444256.

It is an arithmetic number, because the mean of its divisors is an integer number (2915851708).

Almost surely, 2^11656520011 is an apocalyptic number.

11656520011 is a deficient number, since it is larger than the sum of its proper divisors (6886821).

11656520011 is an equidigital number, since it uses as much as digits as its factorization.

11656520011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6886820.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 11656520011 in words is "eleven billion, six hundred fifty-six million, five hundred twenty thousand, eleven".