689145612473 has 2 divisors, whose sum is σ = 689145612474. Its totient is φ = 689145612472.

The previous prime is 689145612427. The next prime is 689145612479. The reversal of 689145612473 is 374216541986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625889841424 + 63255771049 = 791132^2 + 251507^2 .

It is a cyclic number.

It is not a de Polignac number, because 689145612473 - 2¹⁰ = 689145611449 is a prime.

It is not a weakly prime, because it can be changed into another prime (689145612479) 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, 344572806236 + 344572806237.

It is an arithmetic number, because the mean of its divisors is an integer number (344572806237).

Almost surely, 2^689145612473 is an apocalyptic number.

It is an amenable number.

689145612473 is a deficient number, since it is larger than the sum of its proper divisors (1).

689145612473 is an equidigital number, since it uses as much as digits as its factorization.

689145612473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 56.

The spelling of 689145612473 in words is "six hundred eighty-nine billion, one hundred forty-five million, six hundred twelve thousand, four hundred seventy-three".