11655685211 has 4 divisors (see below), whose sum is σ = 11690272152. Its totient is φ = 11621098272.

The previous prime is 11655685207. The next prime is 11655685213. The reversal of 11655685211 is 11258655611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11655685211 - 2² = 11655685207 is a prime.

It is a super-2 number, since 2×11655685211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11655685213) 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, 17292965 + ... + 17293638.

It is an arithmetic number, because the mean of its divisors is an integer number (2922568038).

Almost surely, 2^11655685211 is an apocalyptic number.

11655685211 is a deficient number, since it is larger than the sum of its proper divisors (34586941).

11655685211 is an equidigital number, since it uses as much as digits as its factorization.

11655685211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34586940.

The product of its digits is 72000, while the sum is 41.

The spelling of 11655685211 in words is "eleven billion, six hundred fifty-five million, six hundred eighty-five thousand, two hundred eleven".