689724941797 has 2 divisors, whose sum is σ = 689724941798. Its totient is φ = 689724941796.

The previous prime is 689724941753. The next prime is 689724941803. The reversal of 689724941797 is 797149427986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399283708321 + 290441233476 = 631889^2 + 538926^2 .

It is a cyclic number.

It is not a de Polignac number, because 689724941797 - 2¹⁹ = 689724417509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689704941797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344862470898 + 344862470899.

It is an arithmetic number, because the mean of its divisors is an integer number (344862470899).

Almost surely, 2^689724941797 is an apocalyptic number.

It is an amenable number.

689724941797 is a deficient number, since it is larger than the sum of its proper divisors (1).

689724941797 is an equidigital number, since it uses as much as digits as its factorization.

689724941797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384072192, while the sum is 73.

The spelling of 689724941797 in words is "six hundred eighty-nine billion, seven hundred twenty-four million, nine hundred forty-one thousand, seven hundred ninety-seven".