11856020011 has 4 divisors (see below), whose sum is σ = 12933840024. Its totient is φ = 10778200000.

The previous prime is 11856019957. The next prime is 11856020017. The reversal of 11856020011 is 11002065811.

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: 11002065811 = 11 ⋅1000187801.

It is a cyclic number.

It is not a de Polignac number, because 11856020011 - 2⁷ = 11856019883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11856020017) 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, 538909990 + ... + 538910011.

It is an arithmetic number, because the mean of its divisors is an integer number (3233460006).

Almost surely, 2^11856020011 is an apocalyptic number.

11856020011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11856020011 is a deficient number, since it is larger than the sum of its proper divisors (1077820013).

11856020011 is a wasteful number, since it uses less digits than its factorization.

11856020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077820012.

The product of its (nonzero) digits is 480, while the sum is 25.

Adding to 11856020011 its reverse (11002065811), we get a palindrome (22858085822).

The spelling of 11856020011 in words is "eleven billion, eight hundred fifty-six million, twenty thousand, eleven".