689658655869 has 12 divisors (see below), whose sum is σ = 1030524428700. Its totient is φ = 443918215104.

The previous prime is 689658655789. The next prime is 689658655901. The reversal of 689658655869 is 968556856986.

689658655869 is a `hidden beast` number, since 6 + 8 + 9 + 6 + 58 + 6 + 558 + 6 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 228305262969 + 461353392900 = 477813^2 + 679230^2 .

It is not a de Polignac number, because 689658655869 - 2¹¹ = 689658653821 is a prime.

It is a super-2 number, since 2×689658655869² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689658655669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1321184904 + ... + 1321185425.

It is an arithmetic number, because the mean of its divisors is an integer number (85877035725).

Almost surely, 2^689658655869 is an apocalyptic number.

It is an amenable number.

689658655869 is a deficient number, since it is larger than the sum of its proper divisors (340865772831).

689658655869 is a wasteful number, since it uses less digits than its factorization.

689658655869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642370364 (or 2642370361 counting only the distinct ones).

The product of its digits is 6718464000, while the sum is 81.

The spelling of 689658655869 in words is "six hundred eighty-nine billion, six hundred fifty-eight million, six hundred fifty-five thousand, eight hundred sixty-nine".