689566919580 has 384 divisors, whose sum is σ = 2760969093120. Its totient is φ = 138664224000.

The previous prime is 689566919551. The next prime is 689566919593. The reversal of 689566919580 is 85919665986.

689566919580 is a `hidden beast` number, since 6 + 8 + 9 + 566 + 9 + 1 + 9 + 58 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 689566919499 and 689566919508.

It is a congruent number.

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, 1021495 + ... + 1556465.

It is an arithmetic number, because the mean of its divisors is an integer number (7190023680).

Almost surely, 2^689566919580 is an apocalyptic number.

689566919580 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 689566919580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380484546560).

689566919580 is an abundant number, since it is smaller than the sum of its proper divisors (2071402173540).

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

689566919580 is a wasteful number, since it uses less digits than its factorization.

689566919580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535038 (or 535030 counting only the distinct ones).

The product of its (nonzero) digits is 251942400, while the sum is 72.

The spelling of 689566919580 in words is "six hundred eighty-nine billion, five hundred sixty-six million, nine hundred nineteen thousand, five hundred eighty".