671618435069 has 2 divisors, whose sum is σ = 671618435070. Its totient is φ = 671618435068.

The previous prime is 671618435063. The next prime is 671618435099. The reversal of 671618435069 is 960534816176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671170562500 + 447872569 = 819250^2 + 21163^2 .

It is a cyclic number.

It is not a de Polignac number, because 671618435069 - 2¹⁶ = 671618369533 is a prime.

It is a super-2 number, since 2×671618435069² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671618435063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335809217534 + 335809217535.

It is an arithmetic number, because the mean of its divisors is an integer number (335809217535).

Almost surely, 2^671618435069 is an apocalyptic number.

It is an amenable number.

671618435069 is a deficient number, since it is larger than the sum of its proper divisors (1).

671618435069 is an equidigital number, since it uses as much as digits as its factorization.

671618435069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 671618435069 in words is "six hundred seventy-one billion, six hundred eighteen million, four hundred thirty-five thousand, sixty-nine".