684727729669 has 2 divisors, whose sum is σ = 684727729670. Its totient is φ = 684727729668.

The previous prime is 684727729663. The next prime is 684727729717. The reversal of 684727729669 is 966927727486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585013879044 + 99713850625 = 764862^2 + 315775^2 .

It is a cyclic number.

It is not a de Polignac number, because 684727729669 - 2³ = 684727729661 is a prime.

It is a super-2 number, since 2×684727729669² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684727729661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342363864834 + 342363864835.

It is an arithmetic number, because the mean of its divisors is an integer number (342363864835).

Almost surely, 2^684727729669 is an apocalyptic number.

It is an amenable number.

684727729669 is a deficient number, since it is larger than the sum of its proper divisors (1).

684727729669 is an equidigital number, since it uses as much as digits as its factorization.

684727729669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768144384, while the sum is 73.

The spelling of 684727729669 in words is "six hundred eighty-four billion, seven hundred twenty-seven million, seven hundred twenty-nine thousand, six hundred sixty-nine".