506156666 has 8 divisors (see below), whose sum is σ = 759981684. Its totient is φ = 252829440.

The previous prime is 506156663. The next prime is 506156671. The reversal of 506156666 is 666651605.

It can be written as a sum of positive squares in 2 ways, for example, as 495730225 + 10426441 = 22265^2 + 3229^2 .

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

It is not an unprimeable number, because it can be changed into a prime (506156663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121895 + ... + 125978.

Almost surely, 2^506156666 is an apocalyptic number.

506156666 is a deficient number, since it is larger than the sum of its proper divisors (253825018).

506156666 is a wasteful number, since it uses less digits than its factorization.

506156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248896.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 506156666 is about 22497.9258155057. The cubic root of 506156666 is about 796.9449450249.

The spelling of 506156666 in words is "five hundred six million, one hundred fifty-six thousand, six hundred sixty-six".