684651291229 has 2 divisors, whose sum is σ = 684651291230. Its totient is φ = 684651291228.

The previous prime is 684651291173. The next prime is 684651291343. The reversal of 684651291229 is 922192156486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513336425625 + 171314865604 = 716475^2 + 413902^2 .

It is a cyclic number.

It is not a de Polignac number, because 684651291229 - 2¹¹ = 684651289181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684651291229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684651291829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342325645614 + 342325645615.

It is an arithmetic number, because the mean of its divisors is an integer number (342325645615).

Almost surely, 2^684651291229 is an apocalyptic number.

It is an amenable number.

684651291229 is a deficient number, since it is larger than the sum of its proper divisors (1).

684651291229 is an equidigital number, since it uses as much as digits as its factorization.

684651291229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 55.

The spelling of 684651291229 in words is "six hundred eighty-four billion, six hundred fifty-one million, two hundred ninety-one thousand, two hundred twenty-nine".