686665265 has 32 divisors (see below), whose sum is σ = 970171776. Its totient is φ = 459970560.

The previous prime is 686665261. The next prime is 686665279. The reversal of 686665265 is 562566686.

It is not a de Polignac number, because 686665265 - 2² = 686665261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686665261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480482 + ... + 481908.

It is an arithmetic number, because the mean of its divisors is an integer number (30317868).

Almost surely, 2^686665265 is an apocalyptic number.

686665265 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

686665265 is a deficient number, since it is larger than the sum of its proper divisors (283506511).

686665265 is a wasteful number, since it uses less digits than its factorization.

686665265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129.

The product of its digits is 3110400, while the sum is 50.

The square root of 686665265 is about 26204.2985977492. The cubic root of 686665265 is about 882.2297385231.

The spelling of 686665265 in words is "six hundred eighty-six million, six hundred sixty-five thousand, two hundred sixty-five".