505061661 has 8 divisors (see below), whose sum is σ = 725216800. Its totient is φ = 310807152.

The previous prime is 505061647. The next prime is 505061677. The reversal of 505061661 is 166160505.

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

It is a de Polignac number, because none of the positive numbers 2^k-505061661 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 (505061681) 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, 6475111 + ... + 6475188.

It is an arithmetic number, because the mean of its divisors is an integer number (90652100).

Almost surely, 2^505061661 is an apocalyptic number.

It is an amenable number.

505061661 is a deficient number, since it is larger than the sum of its proper divisors (220155139).

505061661 is a wasteful number, since it uses less digits than its factorization.

505061661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12950315.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 505061661 is about 22473.5769516114. The cubic root of 505061661 is about 796.3698340558.

The spelling of 505061661 in words is "five hundred five million, sixty-one thousand, six hundred sixty-one".