671622216857 has 2 divisors, whose sum is σ = 671622216858. Its totient is φ = 671622216856.

The previous prime is 671622216817. The next prime is 671622216887. The reversal of 671622216857 is 758612226176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640209617161 + 31412599696 = 800131^2 + 177236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671622216857 is a prime.

It is a super-2 number, since 2×671622216857² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671622216799 and 671622216808.

It is not a weakly prime, because it can be changed into another prime (671622216817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335811108428 + 335811108429.

It is an arithmetic number, because the mean of its divisors is an integer number (335811108429).

Almost surely, 2^671622216857 is an apocalyptic number.

It is an amenable number.

671622216857 is a deficient number, since it is larger than the sum of its proper divisors (1).

671622216857 is an equidigital number, since it uses as much as digits as its factorization.

671622216857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 53.

The spelling of 671622216857 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, eight hundred fifty-seven".