2165223156444 has 18 divisors (see below), whose sum is σ = 5473202978880. Its totient is φ = 721741052136.

The previous prime is 2165223156413. The next prime is 2165223156479. The reversal of 2165223156444 is 4446513225612.

It is a happy number.

2165223156444 is a `hidden beast` number, since 2 + 1 + 6 + 52 + 2 + 3 + 156 + 444 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 2165223156444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30072543804 + ... + 30072543875.

It is an arithmetic number, because the mean of its divisors is an integer number (304066832160).

Almost surely, 2^{2165223156444} is an apocalyptic number.

It is an amenable number.

2165223156444 is an abundant number, since it is smaller than the sum of its proper divisors (3307979822436).

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

2165223156444 is a wasteful number, since it uses less digits than its factorization.

2165223156444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60145087689 (or 60145087684 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 45.

The spelling of 2165223156444 in words is "two trillion, one hundred sixty-five billion, two hundred twenty-three million, one hundred fifty-six thousand, four hundred forty-four".