6685538408 has 16 divisors (see below), whose sum is σ = 12536298180. Its totient is φ = 3342525568.

The previous prime is 6685538381. The next prime is 6685538411. The reversal of 6685538408 is 8048355866.

It can be written as a sum of positive squares in 2 ways, for example, as 6664763044 + 20775364 = 81638^2 + 4558^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6685538408.

It is an unprimeable number.

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, 146966 + ... + 187002.

Almost surely, 2^6685538408 is an apocalyptic number.

It is an amenable number.

6685538408 is a deficient number, since it is larger than the sum of its proper divisors (5850759772).

6685538408 is a wasteful number, since it uses less digits than its factorization.

6685538408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60916 (or 60912 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 53.

The square root of 6685538408 is about 81765.1417659139. The cubic root of 6685538408 is about 1883.8462835294.

The spelling of 6685538408 in words is "six billion, six hundred eighty-five million, five hundred thirty-eight thousand, four hundred eight".