689536558421 has 8 divisors (see below), whose sum is σ = 690082905240. Its totient is φ = 688990362112.

The previous prime is 689536558411. The next prime is 689536558429. The reversal of 689536558421 is 124855635986.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23990602321 + 665545956100 = 154889^2 + 815810^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689536558421 - 2¹⁸ = 689536296277 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 (689536558429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10213745 + ... + 10281033.

It is an arithmetic number, because the mean of its divisors is an integer number (86260363155).

Almost surely, 2^689536558421 is an apocalyptic number.

It is an amenable number.

689536558421 is a deficient number, since it is larger than the sum of its proper divisors (546346819).

689536558421 is a wasteful number, since it uses less digits than its factorization.

689536558421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75255.

The product of its digits is 62208000, while the sum is 62.

The spelling of 689536558421 in words is "six hundred eighty-nine billion, five hundred thirty-six million, five hundred fifty-eight thousand, four hundred twenty-one".