689682081853 has 2 divisors, whose sum is σ = 689682081854. Its totient is φ = 689682081852.

The previous prime is 689682081839. The next prime is 689682081871. The reversal of 689682081853 is 358180286986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362340190809 + 327341891044 = 601947^2 + 572138^2 .

It is a cyclic number.

It is not a de Polignac number, because 689682081853 - 2¹⁷ = 689681950781 is a prime.

It is a super-2 number, since 2×689682081853² (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 (689682031853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344841040926 + 344841040927.

It is an arithmetic number, because the mean of its divisors is an integer number (344841040927).

Almost surely, 2^689682081853 is an apocalyptic number.

It is an amenable number.

689682081853 is a deficient number, since it is larger than the sum of its proper divisors (1).

689682081853 is an equidigital number, since it uses as much as digits as its factorization.

689682081853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39813120, while the sum is 64.

The spelling of 689682081853 in words is "six hundred eighty-nine billion, six hundred eighty-two million, eighty-one thousand, eight hundred fifty-three".