11218408665 has 16 divisors (see below), whose sum is σ = 17963994048. Its totient is φ = 5978304576.

The previous prime is 11218408651. The next prime is 11218408673. The reversal of 11218408665 is 56680481211.

It is not a de Polignac number, because 11218408665 - 2⁶ = 11218408601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283747 + ... + 320856.

It is an arithmetic number, because the mean of its divisors is an integer number (1122749628).

Almost surely, 2^11218408665 is an apocalyptic number.

11218408665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11218408665 is a deficient number, since it is larger than the sum of its proper divisors (6745585383).

11218408665 is a wasteful number, since it uses less digits than its factorization.

11218408665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605848.

The product of its (nonzero) digits is 92160, while the sum is 42.

Adding to 11218408665 its reverse (56680481211), we get a palindrome (67898889876).

The spelling of 11218408665 in words is "eleven billion, two hundred eighteen million, four hundred eight thousand, six hundred sixty-five".