501665500 has 48 divisors (see below), whose sum is σ = 1252165824. Its totient is φ = 171998400.

The previous prime is 501665471. The next prime is 501665503. The reversal of 501665500 is 5566105.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501665503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68167 + ... + 75166.

It is an arithmetic number, because the mean of its divisors is an integer number (26086788).

Almost surely, 2^501665500 is an apocalyptic number.

501665500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

501665500 is an abundant number, since it is smaller than the sum of its proper divisors (750500324).

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

501665500 is a wasteful number, since it uses less digits than its factorization.

501665500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143359 (or 143347 counting only the distinct ones).

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

The square root of 501665500 is about 22397.8905256723. The cubic root of 501665500 is about 794.5808214357.

The spelling of 501665500 in words is "five hundred one million, six hundred sixty-five thousand, five hundred".