671217512569 has 2 divisors, whose sum is σ = 671217512570. Its totient is φ = 671217512568.

The previous prime is 671217512549. The next prime is 671217512591. The reversal of 671217512569 is 965215712176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392016236544 + 279201276025 = 626112^2 + 528395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671217512569 is a prime.

It is a super-2 number, since 2×671217512569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671217512549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335608756284 + 335608756285.

It is an arithmetic number, because the mean of its divisors is an integer number (335608756285).

Almost surely, 2^671217512569 is an apocalyptic number.

It is an amenable number.

671217512569 is a deficient number, since it is larger than the sum of its proper divisors (1).

671217512569 is an equidigital number, since it uses as much as digits as its factorization.

671217512569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 52.

The spelling of 671217512569 in words is "six hundred seventy-one billion, two hundred seventeen million, five hundred twelve thousand, five hundred sixty-nine".