506631661 has 8 divisors (see below), whose sum is σ = 514428800. Its totient is φ = 498869280.

The previous prime is 506631589. The next prime is 506631683. The reversal of 506631661 is 166136605.

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 506631661 - 2⁹ = 506631149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506631691) 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 7 ways as a sum of consecutive naturals, for example, 21481 + ... + 38401.

It is an arithmetic number, because the mean of its divisors is an integer number (64303600).

Almost surely, 2^506631661 is an apocalyptic number.

It is an amenable number.

506631661 is a deficient number, since it is larger than the sum of its proper divisors (7797139).

506631661 is a wasteful number, since it uses less digits than its factorization.

506631661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17379.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 506631661 is about 22508.4797576380. The cubic root of 506631661 is about 797.1941606914.

The spelling of 506631661 in words is "five hundred six million, six hundred thirty-one thousand, six hundred sixty-one".