689678524429 has 2 divisors, whose sum is σ = 689678524430. Its totient is φ = 689678524428.

The previous prime is 689678524427. The next prime is 689678524441. The reversal of 689678524429 is 924425876986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682651055529 + 7027468900 = 826227^2 + 83830^2 .

It is a cyclic number.

It is not a de Polignac number, because 689678524429 - 2¹ = 689678524427 is a prime.

Together with 689678524427, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689678524427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344839262214 + 344839262215.

It is an arithmetic number, because the mean of its divisors is an integer number (344839262215).

Almost surely, 2^689678524429 is an apocalyptic number.

It is an amenable number.

689678524429 is a deficient number, since it is larger than the sum of its proper divisors (1).

689678524429 is an equidigital number, since it uses as much as digits as its factorization.

689678524429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 418037760, while the sum is 70.

The spelling of 689678524429 in words is "six hundred eighty-nine billion, six hundred seventy-eight million, five hundred twenty-four thousand, four hundred twenty-nine".