506720661 has 8 divisors (see below), whose sum is σ = 693887904. Its totient is φ = 328683600.

The previous prime is 506720657. The next prime is 506720689. The reversal of 506720661 is 166027605.

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

It is not a de Polignac number, because 506720661 - 2² = 506720657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506720611) 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, 2282415 + ... + 2282636.

It is an arithmetic number, because the mean of its divisors is an integer number (86735988).

Almost surely, 2^506720661 is an apocalyptic number.

It is an amenable number.

506720661 is a deficient number, since it is larger than the sum of its proper divisors (187167243).

506720661 is a wasteful number, since it uses less digits than its factorization.

506720661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565091.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 506720661 is about 22510.4567034967. The cubic root of 506720661 is about 797.2408389994.

The spelling of 506720661 in words is "five hundred six million, seven hundred twenty thousand, six hundred sixty-one".