506016661 has 4 divisors (see below), whose sum is σ = 506371212. Its totient is φ = 505662112.

The previous prime is 506016653. The next prime is 506016691. The reversal of 506016661 is 166610605.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 380016036 + 126000625 = 19494^2 + 11225^2 .

It is a cyclic number.

It is not a de Polignac number, because 506016661 - 2³ = 506016653 is a prime.

It is a super-2 number, since 2×506016661² = 512105722419177842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506016691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175126 + ... + 177991.

It is an arithmetic number, because the mean of its divisors is an integer number (126592803).

Almost surely, 2^506016661 is an apocalyptic number.

It is an amenable number.

506016661 is a deficient number, since it is larger than the sum of its proper divisors (354551).

506016661 is a wasteful number, since it uses less digits than its factorization.

506016661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354550.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 506016661 is about 22494.8140912522. The cubic root of 506016661 is about 796.8714588406.

The spelling of 506016661 in words is "five hundred six million, sixteen thousand, six hundred sixty-one".