689332053645 has 12 divisors (see below), whose sum is σ = 1194842226396. Its totient is φ = 367643761920.

The previous prime is 689332053637. The next prime is 689332053647. The reversal of 689332053645 is 546350233986.

689332053645 is a `hidden beast` number, since 6 + 89 + 3 + 3 + 20 + 536 + 4 + 5 = 666.

689332053645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 314912891241 + 374419162404 = 561171^2 + 611898^2 .

It is not a de Polignac number, because 689332053645 - 2³ = 689332053637 is a prime.

It is a super-3 number, since 3×689332053645³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 689332053591 and 689332053600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689332053647) 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, 7659244996 + ... + 7659245085.

It is an arithmetic number, because the mean of its divisors is an integer number (99570185533).

Almost surely, 2^689332053645 is an apocalyptic number.

It is an amenable number.

689332053645 is a deficient number, since it is larger than the sum of its proper divisors (505510172751).

689332053645 is a wasteful number, since it uses less digits than its factorization.

689332053645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15318490092 (or 15318490089 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 54.

The spelling of 689332053645 in words is "six hundred eighty-nine billion, three hundred thirty-two million, fifty-three thousand, six hundred forty-five".