7685686418 has 4 divisors (see below), whose sum is σ = 11528529630. Its totient is φ = 3842843208.

The previous prime is 7685686397. The next prime is 7685686423. The reversal of 7685686418 is 8146865867.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 4438624129 + 3247062289 = 66623^2 + 56983^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1921421603 + ... + 1921421606.

Almost surely, 2^7685686418 is an apocalyptic number.

7685686418 is a deficient number, since it is larger than the sum of its proper divisors (3842843212).

7685686418 is a wasteful number, since it uses less digits than its factorization.

7685686418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3842843211.

The product of its digits is 15482880, while the sum is 59.

The square root of 7685686418 is about 87668.0467331171. The cubic root of 7685686418 is about 1973.4564807478.

The spelling of 7685686418 in words is "seven billion, six hundred eighty-five million, six hundred eighty-six thousand, four hundred eighteen".