689707232437 has 2 divisors, whose sum is σ = 689707232438. Its totient is φ = 689707232436.

The previous prime is 689707232381. The next prime is 689707232443. The reversal of 689707232437 is 734232707986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611635049041 + 78072183396 = 782071^2 + 279414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689707232437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689707292437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344853616218 + 344853616219.

It is an arithmetic number, because the mean of its divisors is an integer number (344853616219).

Almost surely, 2^689707232437 is an apocalyptic number.

It is an amenable number.

689707232437 is a deficient number, since it is larger than the sum of its proper divisors (1).

689707232437 is an equidigital number, since it uses as much as digits as its factorization.

689707232437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 58.

The spelling of 689707232437 in words is "six hundred eighty-nine billion, seven hundred seven million, two hundred thirty-two thousand, four hundred thirty-seven".