671622216817 has 2 divisors, whose sum is σ = 671622216818. Its totient is φ = 671622216816.

The previous prime is 671622216703. The next prime is 671622216857. The reversal of 671622216817 is 718612226176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409733130816 + 261889086001 = 640104^2 + 511751^2 .

It is a cyclic number.

It is not a de Polignac number, because 671622216817 - 2¹⁹ = 671621692529 is a prime.

It is a super-2 number, since 2×671622216817² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671622216857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335811108408 + 335811108409.

It is an arithmetic number, because the mean of its divisors is an integer number (335811108409).

Almost surely, 2^671622216817 is an apocalyptic number.

It is an amenable number.

671622216817 is a deficient number, since it is larger than the sum of its proper divisors (1).

671622216817 is an equidigital number, since it uses as much as digits as its factorization.

671622216817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The spelling of 671622216817 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, eight hundred seventeen".