2165215555 has 8 divisors (see below), whose sum is σ = 2599885152. Its totient is φ = 1731088128.

The previous prime is 2165215529. The next prime is 2165215583. The reversal of 2165215555 is 5555125612.

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 2165215555 - 2¹⁷ = 2165084483 is a prime.

It is a super-2 number, since 2×2165215555² = 9376316799227916050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126702 + ... + 142771.

It is an arithmetic number, because the mean of its divisors is an integer number (324985644).

Almost surely, 2^2165215555 is an apocalyptic number.

2165215555 is a deficient number, since it is larger than the sum of its proper divisors (434669597).

2165215555 is a wasteful number, since it uses less digits than its factorization.

2165215555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271085.

The product of its digits is 75000, while the sum is 37.

The square root of 2165215555 is about 46531.8767620649. The cubic root of 2165215555 is about 1293.7004011262.

The spelling of 2165215555 in words is "two billion, one hundred sixty-five million, two hundred fifteen thousand, five hundred fifty-five".