5115561666 has 8 divisors (see below), whose sum is σ = 10231123344. Its totient is φ = 1705187220.

The previous prime is 5115561637. The next prime is 5115561673. The reversal of 5115561666 is 6661655115.

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

5115561666 is an admirable number.

It is a Curzon number.

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, 426296800 + ... + 426296811.

It is an arithmetic number, because the mean of its divisors is an integer number (1278890418).

Almost surely, 2^5115561666 is an apocalyptic number.

5115561666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5115561666 is a wasteful number, since it uses less digits than its factorization.

5115561666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852593616.

The product of its digits is 162000, while the sum is 42.

The square root of 5115561666 is about 71523.1547542472. The cubic root of 5115561666 is about 1723.0495819695.

The spelling of 5115561666 in words is "five billion, one hundred fifteen million, five hundred sixty-one thousand, six hundred sixty-six".