689461143640 has 16 divisors (see below), whose sum is σ = 1551287573280. Its totient is φ = 275784457440.

The previous prime is 689461143617. The next prime is 689461143703. The reversal of 689461143640 is 46341164986.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8618264256 + ... + 8618264335.

It is an arithmetic number, because the mean of its divisors is an integer number (96955473330).

Almost surely, 2^689461143640 is an apocalyptic number.

It is an amenable number.

689461143640 is an abundant number, since it is smaller than the sum of its proper divisors (861826429640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689461143640 is a wasteful number, since it uses less digits than its factorization.

689461143640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17236528602 (or 17236528598 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 689461143640 in words is "six hundred eighty-nine billion, four hundred sixty-one million, one hundred forty-three thousand, six hundred forty".