6681687442 has 8 divisors (see below), whose sum is σ = 10056738636. Its totient is φ = 3329441232.

The previous prime is 6681687413. The next prime is 6681687457. The reversal of 6681687442 is 2447861866.

It can be written as a sum of positive squares in 2 ways, for example, as 4842907281 + 1838780161 = 69591^2 + 42881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6681687442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5700513 + ... + 5701684.

Almost surely, 2^6681687442 is an apocalyptic number.

6681687442 is a deficient number, since it is larger than the sum of its proper divisors (3375051194).

6681687442 is a wasteful number, since it uses less digits than its factorization.

6681687442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11402492.

The product of its digits is 3096576, while the sum is 52.

The square root of 6681687442 is about 81741.5894266805. The cubic root of 6681687442 is about 1883.4845065658.

It can be divided in two parts, 668168 and 7442, that multiplied together give a square (4972506256 = 70516²).

The spelling of 6681687442 in words is "six billion, six hundred eighty-one million, six hundred eighty-seven thousand, four hundred forty-two".