686665001061 has 12 divisors (see below), whose sum is σ = 1068145557388. Its totient is φ = 422563077504.

The previous prime is 686665001051. The next prime is 686665001069. The reversal of 686665001061 is 160100566686.

686665001061 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 265399098561 + 421265902500 = 515169^2 + 649050^2 .

It is not a de Polignac number, because 686665001061 - 2¹³ = 686664992869 is a prime.

It is a super-2 number, since 2×686665001061² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686665000998 and 686665001016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686665001069) 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, 2934465700 + ... + 2934465933.

Almost surely, 2^686665001061 is an apocalyptic number.

It is an amenable number.

686665001061 is a deficient number, since it is larger than the sum of its proper divisors (381480556327).

686665001061 is a wasteful number, since it uses less digits than its factorization.

686665001061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868931652 (or 5868931649 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 686665001061 in words is "six hundred eighty-six billion, six hundred sixty-five million, one thousand, sixty-one".