505605055666 has 8 divisors (see below), whose sum is σ = 776905329564. Its totient is φ = 246636612480.

The previous prime is 505605055663. The next prime is 505605055667. The reversal of 505605055666 is 666550506505.

It can be written as a sum of positive squares in 2 ways, for example, as 477106551441 + 28498504225 = 690729^2 + 168815^2 .

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 (505605055663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3082957575 + ... + 3082957738.

Almost surely, 2^505605055666 is an apocalyptic number.

505605055666 is a deficient number, since it is larger than the sum of its proper divisors (271300273898).

505605055666 is a wasteful number, since it uses less digits than its factorization.

505605055666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165915356.

The product of its (nonzero) digits is 4050000, while the sum is 49.

The spelling of 505605055666 in words is "five hundred five billion, six hundred five million, fifty-five thousand, six hundred sixty-six".