671622216549 has 16 divisors (see below), whose sum is σ = 896010377472. Its totient is φ = 447491184128.

The previous prime is 671622216523. The next prime is 671622216571. The reversal of 671622216549 is 945612226176.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 671622216549 - 2⁹ = 671622216037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671622216049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57609529 + ... + 57621185.

It is an arithmetic number, because the mean of its divisors is an integer number (56000648592).

Almost surely, 2^671622216549 is an apocalyptic number.

It is an amenable number.

671622216549 is a deficient number, since it is larger than the sum of its proper divisors (224388160923).

671622216549 is a wasteful number, since it uses less digits than its factorization.

671622216549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21036.

The product of its digits is 2177280, while the sum is 51.

The spelling of 671622216549 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, five hundred forty-nine".