685545586 has 24 divisors (see below), whose sum is σ = 1133678700. Its totient is φ = 310680480.

The previous prime is 685545569. The next prime is 685545617.

685545586 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 601181361 + 84364225 = 24519^2 + 9185^2 .

It is a super-7 number, since 7×685545586⁷ (a number of 63 digits) contains 7777777 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80400 + ... + 88516.

Almost surely, 2^685545586 is an apocalyptic number.

685545586 is a deficient number, since it is larger than the sum of its proper divisors (448133114).

685545586 is a wasteful number, since it uses less digits than its factorization.

685545586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490 (or 8479 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 52.

The square root of 685545586 is about 26182.9254667999. The cubic root of 685545586 is about 881.7499552576.

It can be divided in two parts, 6855 and 45586, that added together give a square (52441 = 229²).

The spelling of 685545586 in words is "six hundred eighty-five million, five hundred forty-five thousand, five hundred eighty-six".