12011511611 has 6 divisors (see below), whose sum is σ = 13202736036. Its totient is φ = 10919555900.

The previous prime is 12011511607. The next prime is 12011511623. The reversal of 12011511611 is 11611511021.

It is not a de Polignac number, because 12011511611 - 2² = 12011511607 is a prime.

It is a super-3 number, since 3×12011511611³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011511641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49634225 + ... + 49634466.

It is an arithmetic number, because the mean of its divisors is an integer number (2200456006).

Almost surely, 2^12011511611 is an apocalyptic number.

12011511611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12011511611 is a deficient number, since it is larger than the sum of its proper divisors (1191224425).

12011511611 is an equidigital number, since it uses as much as digits as its factorization.

12011511611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99268713 (or 99268702 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 20.

The spelling of 12011511611 in words is "twelve billion, eleven million, five hundred eleven thousand, six hundred eleven".