686806577 has 4 divisors (see below), whose sum is σ = 687243120. Its totient is φ = 686370036.

The previous prime is 686806567. The next prime is 686806591. The reversal of 686806577 is 775608686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686806577 - 2⁶ = 686806513 is a prime.

It is a super-3 number, since 3×686806577³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686806517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215903 + ... + 219060.

It is an arithmetic number, because the mean of its divisors is an integer number (171810780).

Almost surely, 2^686806577 is an apocalyptic number.

It is an amenable number.

686806577 is a deficient number, since it is larger than the sum of its proper divisors (436543).

686806577 is a wasteful number, since it uses less digits than its factorization.

686806577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436542.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The square root of 686806577 is about 26206.9948105463. The cubic root of 686806577 is about 882.2902537426.

It can be divided in two parts, 68680 and 6577, that added together give a palindrome (75257).

The spelling of 686806577 in words is "six hundred eighty-six million, eight hundred six thousand, five hundred seventy-seven".