689512706879 has 2 divisors, whose sum is σ = 689512706880. Its totient is φ = 689512706878.

The previous prime is 689512706809. The next prime is 689512706899. The reversal of 689512706879 is 978607215986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689512706879 - 2³⁶ = 620793230143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689512706809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344756353439 + 344756353440.

It is an arithmetic number, because the mean of its divisors is an integer number (344756353440).

Almost surely, 2^689512706879 is an apocalyptic number.

689512706879 is a deficient number, since it is larger than the sum of its proper divisors (1).

689512706879 is an equidigital number, since it uses as much as digits as its factorization.

689512706879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91445760, while the sum is 68.

The spelling of 689512706879 in words is "six hundred eighty-nine billion, five hundred twelve million, seven hundred six thousand, eight hundred seventy-nine".