5000000661 has 12 divisors (see below), whose sum is σ = 7417418892. Its totient is φ = 3243243456.

The previous prime is 5000000641. The next prime is 5000000669. The reversal of 5000000661 is 1660000005.

5000000661 is a `hidden beast` number, since 5 + 0 + 0 + 0 + 0 + 0 + 0 + 661 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3864984561 + 1135016100 = 62169^2 + 33690^2 .

It is not a de Polignac number, because 5000000661 - 2¹³ = 4999992469 is a prime.

It is a super-2 number, since 2×5000000661² = 50000013220000873842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5000000669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7507176 + ... + 7507841.

It is an arithmetic number, because the mean of its divisors is an integer number (618118241).

Almost surely, 2^5000000661 is an apocalyptic number.

It is an amenable number.

5000000661 is a deficient number, since it is larger than the sum of its proper divisors (2417418231).

5000000661 is a wasteful number, since it uses less digits than its factorization.

5000000661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15015060 (or 15015057 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 5000000661 is about 70710.6827926304. The cubic root of 5000000661 is about 1709.9760220296.

Adding to 5000000661 its reverse (1660000005), we get a palindrome (6660000666).

The spelling of 5000000661 in words is "five billion, six hundred sixty-one", and thus it is an aban number.