689223738025 has 27 divisors (see below), whose sum is σ = 907960410469. Its totient is φ = 518891799680.

The previous prime is 689223738023. The next prime is 689223738031. The reversal of 689223738025 is 520837322986.

The square root of 689223738025 is 830195.

It is a perfect power (a square), and thus also a powerful number.

689223738025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 16121634841 + 673102103184 = 126971^2 + 820428^2 .

It is not a de Polignac number, because 689223738025 - 2¹ = 689223738023 is a prime.

It is a super-2 number, since 2×689223738025² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689223738023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 70561692 + ... + 70571458.

Almost surely, 2^689223738025 is an apocalyptic number.

689223738025 is the 830195-th square number.

689223738025 is the 415098-th centered octagonal number.

It is an amenable number.

689223738025 is a deficient number, since it is larger than the sum of its proper divisors (218736672444).

689223738025 is an frugal number, since it uses more digits than its factorization.

689223738025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19578 (or 9789 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 689223738025 in words is "six hundred eighty-nine billion, two hundred twenty-three million, seven hundred thirty-eight thousand, twenty-five".