6538086665 has 16 divisors (see below), whose sum is σ = 8790275520. Its totient is φ = 4626457920.

The previous prime is 6538086649. The next prime is 6538086671. The reversal of 6538086665 is 5666808356.

It is a happy number.

It is not a de Polignac number, because 6538086665 - 2⁴ = 6538086649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1604375 + ... + 1608444.

It is an arithmetic number, because the mean of its divisors is an integer number (549392220).

Almost surely, 2^6538086665 is an apocalyptic number.

It is an amenable number.

6538086665 is a deficient number, since it is larger than the sum of its proper divisors (2252188855).

6538086665 is a wasteful number, since it uses less digits than its factorization.

6538086665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212872.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The square root of 6538086665 is about 80858.4359544507. The cubic root of 6538086665 is about 1869.8935820745.

The spelling of 6538086665 in words is "six billion, five hundred thirty-eight million, eighty-six thousand, six hundred sixty-five".