505001660 has 48 divisors (see below), whose sum is σ = 1125182016. Its totient is φ = 189729792.

The previous prime is 505001617. The next prime is 505001671. The reversal of 505001660 is 66100505.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 207209 + ... + 209631.

It is an arithmetic number, because the mean of its divisors is an integer number (23441292).

Almost surely, 2^505001660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505001660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (562591008).

505001660 is an abundant number, since it is smaller than the sum of its proper divisors (620180356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505001660 is a wasteful number, since it uses less digits than its factorization.

505001660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062 (or 3060 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 505001660 is about 22472.2419887291. The cubic root of 505001660 is about 796.3382967325.

The spelling of 505001660 in words is "five hundred five million, one thousand, six hundred sixty".