689497331644 has 12 divisors (see below), whose sum is σ = 1316313087768. Its totient is φ = 313407878000.

The previous prime is 689497331623. The next prime is 689497331669. The reversal of 689497331644 is 446133794986.

689497331644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×689497331644² (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 3 ways as a sum of consecutive naturals, for example, 7835196907 + ... + 7835196994.

It is an arithmetic number, because the mean of its divisors is an integer number (109692757314).

Almost surely, 2^689497331644 is an apocalyptic number.

It is an amenable number.

689497331644 is a deficient number, since it is larger than the sum of its proper divisors (626815756124).

689497331644 is a wasteful number, since it uses less digits than its factorization.

689497331644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15670393916 (or 15670393914 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 64.

The spelling of 689497331644 in words is "six hundred eighty-nine billion, four hundred ninety-seven million, three hundred thirty-one thousand, six hundred forty-four".