671622216521 has 8 divisors (see below), whose sum is σ = 693417863424. Its totient is φ = 649834720560.

The previous prime is 671622216493. The next prime is 671622216523. The reversal of 671622216521 is 125612226176.

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

It is a cyclic number.

It is not a de Polignac number, because 671622216521 - 2³⁴ = 654442347337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671622216523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1870046 + ... + 2200071.

It is an arithmetic number, because the mean of its divisors is an integer number (86677232928).

Almost surely, 2^671622216521 is an apocalyptic number.

It is an amenable number.

671622216521 is a deficient number, since it is larger than the sum of its proper divisors (21795646903).

671622216521 is a wasteful number, since it uses less digits than its factorization.

671622216521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075471.

The product of its digits is 120960, while the sum is 41.

The spelling of 671622216521 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, five hundred twenty-one".