11965215666 has 16 divisors (see below), whose sum is σ = 24073729344. Its totient is φ = 3964522224.

The previous prime is 11965215649. The next prime is 11965215673. The reversal of 11965215666 is 66651256911.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5969665 + ... + 5971668.

It is an arithmetic number, because the mean of its divisors is an integer number (1504608084).

Almost surely, 2^11965215666 is an apocalyptic number.

11965215666 is an abundant number, since it is smaller than the sum of its proper divisors (12108513678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11965215666 is a wasteful number, since it uses less digits than its factorization.

11965215666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11941505.

The product of its digits is 583200, while the sum is 48.

The spelling of 11965215666 in words is "eleven billion, nine hundred sixty-five million, two hundred fifteen thousand, six hundred sixty-six".