505500661 has 8 divisors (see below), whose sum is σ = 535443264. Its totient is φ = 475581120.

The previous prime is 505500631. The next prime is 505500673. The reversal of 505500661 is 166005505.

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

It is not a de Polignac number, because 505500661 - 2⁵ = 505500629 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 (505500631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62686 + ... + 70288.

It is an arithmetic number, because the mean of its divisors is an integer number (66930408).

Almost surely, 2^505500661 is an apocalyptic number.

It is an amenable number.

505500661 is a deficient number, since it is larger than the sum of its proper divisors (29942603).

505500661 is a wasteful number, since it uses less digits than its factorization.

505500661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11531.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 505500661 is about 22483.3418556940. The cubic root of 505500661 is about 796.6005023355.

The spelling of 505500661 in words is "five hundred five million, five hundred thousand, six hundred sixty-one".