689540122065984 has 896 divisors, whose sum is σ = 2197426278727680. Its totient is φ = 186706811289600.

The previous prime is 689540122065973. The next prime is 689540122066013. The reversal of 689540122065984 is 489560221045986.

It is a super-2 number, since 2×689540122065984² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 190849741362 + ... + 190849744974.

It is an arithmetic number, because the mean of its divisors is an integer number (2452484686080).

Almost surely, 2^{689540122065984} is an apocalyptic number.

689540122065984 is a gapful number since it is divisible by the number (64) 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 689540122065984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1098713139363840).

689540122065984 is an abundant number, since it is smaller than the sum of its proper divisors (1507886156661696).

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

689540122065984 is a wasteful number, since it uses less digits than its factorization.

689540122065984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4219 (or 4209 counting only the distinct ones).

The product of its (nonzero) digits is 298598400, while the sum is 69.

The spelling of 689540122065984 in words is "six hundred eighty-nine trillion, five hundred forty billion, one hundred twenty-two million, sixty-five thousand, nine hundred eighty-four".