689726840671 has 16 divisors (see below), whose sum is σ = 755091567360. Its totient is φ = 624807953280.

The previous prime is 689726840617. The next prime is 689726840681. The reversal of 689726840671 is 176048627986.

It is a cyclic number.

It is not a de Polignac number, because 689726840671 - 2¹¹ = 689726838623 is a prime.

It is a super-2 number, since 2×689726840671² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689726840681) 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, 6572350 + ... + 6676468.

It is an arithmetic number, because the mean of its divisors is an integer number (47193222960).

Almost surely, 2^689726840671 is an apocalyptic number.

689726840671 is a deficient number, since it is larger than the sum of its proper divisors (65364726689).

689726840671 is a wasteful number, since it uses less digits than its factorization.

689726840671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106254.

The product of its (nonzero) digits is 48771072, while the sum is 64.

The spelling of 689726840671 in words is "six hundred eighty-nine billion, seven hundred twenty-six million, eight hundred forty thousand, six hundred seventy-one".