2215011668165 has 4 divisors (see below), whose sum is σ = 2658014001804. Its totient is φ = 1772009334528.

The previous prime is 2215011668131. The next prime is 2215011668183. The reversal of 2215011668165 is 5618661105122.

2215011668165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 314140072324 + 1900871595841 = 560482^2 + 1378721^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215011668165 - 2⁸ = 2215011667909 is a prime.

It is a super-3 number, since 3×2215011668165³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221501166812 + ... + 221501166821.

It is an arithmetic number, because the mean of its divisors is an integer number (664503500451).

Almost surely, 2^{2215011668165} is an apocalyptic number.

It is an amenable number.

2215011668165 is a deficient number, since it is larger than the sum of its proper divisors (443002333639).

2215011668165 is an equidigital number, since it uses as much as digits as its factorization.

2215011668165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443002333638.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 2215011668165 in words is "two trillion, two hundred fifteen billion, eleven million, six hundred sixty-eight thousand, one hundred sixty-five".