1644023422165 has 16 divisors (see below), whose sum is σ = 2078603913600. Its totient is φ = 1244831049792.

The previous prime is 1644023422147. The next prime is 1644023422201. The reversal of 1644023422165 is 5612243204461.

It is a cyclic number.

It is not a de Polignac number, because 1644023422165 - 2¹³ = 1644023413973 is a prime.

It is a super-3 number, since 3×1644023422165³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7992697 + ... + 8195806.

It is an arithmetic number, because the mean of its divisors is an integer number (129912744600).

Almost surely, 2^{1644023422165} is an apocalyptic number.

It is an amenable number.

1644023422165 is a deficient number, since it is larger than the sum of its proper divisors (434580491435).

1644023422165 is a wasteful number, since it uses less digits than its factorization.

1644023422165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16189596.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 1644023422165 in words is "one trillion, six hundred forty-four billion, twenty-three million, four hundred twenty-two thousand, one hundred sixty-five".