685290665211 has 4 divisors (see below), whose sum is σ = 913720886952. Its totient is φ = 456860443472.

The previous prime is 685290665177. The next prime is 685290665233. The reversal of 685290665211 is 112566092586.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685290665211 - 2⁷ = 685290665083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685290660211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114215110866 + ... + 114215110871.

It is an arithmetic number, because the mean of its divisors is an integer number (228430221738).

Almost surely, 2^685290665211 is an apocalyptic number.

685290665211 is a deficient number, since it is larger than the sum of its proper divisors (228430221741).

685290665211 is a wasteful number, since it uses less digits than its factorization.

685290665211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228430221740.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 685290665211 in words is "six hundred eighty-five billion, two hundred ninety million, six hundred sixty-five thousand, two hundred eleven".