689145612461 has 4 divisors (see below), whose sum is σ = 712909254300. Its totient is φ = 665381970624.

The previous prime is 689145612427. The next prime is 689145612473. The reversal of 689145612461 is 164216541986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 487022536900 + 202123075561 = 697870^2 + 449581^2 .

It is a cyclic number.

It is not a de Polignac number, because 689145612461 - 2¹⁴ = 689145596077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689145612161) 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 in 3 ways as a sum of consecutive naturals, for example, 11881820876 + ... + 11881820933.

It is an arithmetic number, because the mean of its divisors is an integer number (178227313575).

Almost surely, 2^689145612461 is an apocalyptic number.

It is an amenable number.

689145612461 is a deficient number, since it is larger than the sum of its proper divisors (23763641839).

689145612461 is a wasteful number, since it uses less digits than its factorization.

689145612461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23763641838.

The product of its digits is 2488320, while the sum is 53.

The spelling of 689145612461 in words is "six hundred eighty-nine billion, one hundred forty-five million, six hundred twelve thousand, four hundred sixty-one".