4221623678165 has 8 divisors (see below), whose sum is σ = 5065959584088. Its totient is φ = 3377291495680.

The previous prime is 4221623678147. The next prime is 4221623678203. The reversal of 4221623678165 is 5618763261224.

It can be written as a sum of positive squares in 4 ways, for example, as 142673909284 + 4078949768881 = 377722^2 + 2019641^2 .

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

It is not a de Polignac number, because 4221623678165 - 2³⁰ = 4220549936341 is a prime.

It is a Duffinian number.

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, 3369929 + ... + 4449681.

It is an arithmetic number, because the mean of its divisors is an integer number (633244948011).

Almost surely, 2^{4221623678165} is an apocalyptic number.

It is an amenable number.

4221623678165 is a deficient number, since it is larger than the sum of its proper divisors (844335905923).

4221623678165 is a wasteful number, since it uses less digits than its factorization.

4221623678165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861719.

The product of its digits is 5806080, while the sum is 53.

The spelling of 4221623678165 in words is "four trillion, two hundred twenty-one billion, six hundred twenty-three million, six hundred seventy-eight thousand, one hundred sixty-five".