11665665642 has 96 divisors (see below), whose sum is σ = 26015774400. Its totient is φ = 3474803200.

The previous prime is 11665665629. The next prime is 11665665653. The reversal of 11665665642 is 24656656611.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 11665665591 and 11665665600.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8039017 + ... + 8040467.

It is an arithmetic number, because the mean of its divisors is an integer number (270997650).

Almost surely, 2^11665665642 is an apocalyptic number.

11665665642 is an abundant number, since it is smaller than the sum of its proper divisors (14350108758).

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

11665665642 is a wasteful number, since it uses less digits than its factorization.

11665665642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1645 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The spelling of 11665665642 in words is "eleven billion, six hundred sixty-five million, six hundred sixty-five thousand, six hundred forty-two".