689438144509 has 16 divisors (see below), whose sum is σ = 718127280000. Its totient is φ = 661078313280.

The previous prime is 689438144501. The next prime is 689438144519. The reversal of 689438144509 is 905441834986.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 689438144509 - 2³ = 689438144501 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 (689438144501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32790202 + ... + 32811220.

It is an arithmetic number, because the mean of its divisors is an integer number (44882955000).

Almost surely, 2^689438144509 is an apocalyptic number.

It is an amenable number.

689438144509 is a deficient number, since it is larger than the sum of its proper divisors (28689135491).

689438144509 is a wasteful number, since it uses less digits than its factorization.

689438144509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28788.

The product of its (nonzero) digits is 29859840, while the sum is 61.

The spelling of 689438144509 in words is "six hundred eighty-nine billion, four hundred thirty-eight million, one hundred forty-four thousand, five hundred nine".