5115561665 has 8 divisors (see below), whose sum is σ = 6242719680. Its totient is φ = 4023085552.

The previous prime is 5115561637. The next prime is 5115561673. The reversal of 5115561665 is 5661655115.

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

It is a cyclic number.

It is not a de Polignac number, because 5115561665 - 2²⁸ = 4847126209 is a prime.

It is a super-2 number, since 2×5115561665² = 52337942296835144450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8670149 + ... + 8670738.

It is an arithmetic number, because the mean of its divisors is an integer number (780339960).

Almost surely, 2^5115561665 is an apocalyptic number.

It is an amenable number.

5115561665 is a deficient number, since it is larger than the sum of its proper divisors (1127158015).

5115561665 is a wasteful number, since it uses less digits than its factorization.

5115561665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340951.

The product of its digits is 135000, while the sum is 41.

The square root of 5115561665 is about 71523.1547472565. The cubic root of 5115561665 is about 1723.0495818573.

The spelling of 5115561665 in words is "five billion, one hundred fifteen million, five hundred sixty-one thousand, six hundred sixty-five".