689159666640 has 160 divisors (see below), whose sum is σ = 2267601471360. Its totient is φ = 172542246912.

The previous prime is 689159666621. The next prime is 689159666651. The reversal of 689159666640 is 46666951986.

It is a super-2 number, since 2×689159666640² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1462227 + ... + 1875213.

It is an arithmetic number, because the mean of its divisors is an integer number (14172509196).

Almost surely, 2^689159666640 is an apocalyptic number.

689159666640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689159666640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1133800735680).

689159666640 is an abundant number, since it is smaller than the sum of its proper divisors (1578441804720).

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

689159666640 is a wasteful number, since it uses less digits than its factorization.

689159666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413429 (or 413423 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 66.

The spelling of 689159666640 in words is "six hundred eighty-nine billion, one hundred fifty-nine million, six hundred sixty-six thousand, six hundred forty".