6113638665 has 24 divisors (see below), whose sum is σ = 10604754888. Its totient is φ = 3258213120.

The previous prime is 6113638639. The next prime is 6113638709. The reversal of 6113638665 is 5668363116.

6113638665 is a `hidden beast` number, since 6 + 1 + 1 + 3 + 638 + 6 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 233356176 + 5880282489 = 15276^2 + 76683^2 .

It is not a de Polignac number, because 6113638665 - 2⁸ = 6113638409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6113638665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12957 + ... + 111333.

It is an arithmetic number, because the mean of its divisors is an integer number (441864787).

Almost surely, 2^6113638665 is an apocalyptic number.

It is an amenable number.

6113638665 is a deficient number, since it is larger than the sum of its proper divisors (4491116223).

6113638665 is a wasteful number, since it uses less digits than its factorization.

6113638665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99769 (or 99766 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 6113638665 is about 78189.7606148017. The cubic root of 6113638665 is about 1828.5208732346.

The spelling of 6113638665 in words is "six billion, one hundred thirteen million, six hundred thirty-eight thousand, six hundred sixty-five".