11138891665 has 16 divisors (see below), whose sum is σ = 14892076800. Its totient is φ = 7928648320.

The previous prime is 11138891639. The next prime is 11138891681. The reversal of 11138891665 is 56619883111.

It is a happy number.

It is not a de Polignac number, because 11138891665 - 2⁵ = 11138891633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2151940 + ... + 2157109.

It is an arithmetic number, because the mean of its divisors is an integer number (930754800).

Almost surely, 2^11138891665 is an apocalyptic number.

It is an amenable number.

11138891665 is a deficient number, since it is larger than the sum of its proper divisors (3753185135).

11138891665 is a wasteful number, since it uses less digits than its factorization.

11138891665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309112.

The product of its digits is 311040, while the sum is 49.

The spelling of 11138891665 in words is "eleven billion, one hundred thirty-eight million, eight hundred ninety-one thousand, six hundred sixty-five".