22165722170645 has 8 divisors (see below), whose sum is σ = 26615275539000. Its totient is φ = 17721638447040.

The previous prime is 22165722170617. The next prime is 22165722170701. The reversal of 22165722170645 is 54607122756122.

It can be written as a sum of positive squares in 4 ways, for example, as 5586118069009 + 16579604101636 = 2363497^2 + 4071806^2 .

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

It is not a de Polignac number, because 22165722170645 - 2⁴² = 17767675659541 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22165722170593 and 22165722170602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367402270 + ... + 1367418479.

It is an arithmetic number, because the mean of its divisors is an integer number (3326909442375).

Almost surely, 2^{22165722170645} is an apocalyptic number.

It is an amenable number.

22165722170645 is a deficient number, since it is larger than the sum of its proper divisors (4449553368355).

22165722170645 is a wasteful number, since it uses less digits than its factorization.

22165722170645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734822375.

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 22165722170645 in words is "twenty-two trillion, one hundred sixty-five billion, seven hundred twenty-two million, one hundred seventy thousand, six hundred forty-five".