11111555665 has 8 divisors (see below), whose sum is σ = 15238704960. Its totient is φ = 7619352432.

The previous prime is 11111555659. The next prime is 11111555677. The reversal of 11111555665 is 56655511111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111555665 - 2⁷ = 11111555537 is a prime.

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, 158736475 + ... + 158736544.

It is an arithmetic number, because the mean of its divisors is an integer number (1904838120).

Almost surely, 2^11111555665 is an apocalyptic number.

It is an amenable number.

11111555665 is a deficient number, since it is larger than the sum of its proper divisors (4127149295).

11111555665 is an equidigital number, since it uses as much as digits as its factorization.

11111555665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317473031.

The product of its digits is 22500, while the sum is 37.

The spelling of 11111555665 in words is "eleven billion, one hundred eleven million, five hundred fifty-five thousand, six hundred sixty-five".