501666056220 has 144 divisors (see below), whose sum is σ = 1678160484000. Its totient is φ = 111567407616.

The previous prime is 501666056209. The next prime is 501666056239. The reversal of 501666056220 is 22650666105.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2197095 + ... + 2414654.

It is an arithmetic number, because the mean of its divisors is an integer number (11653892250).

Almost surely, 2^501666056220 is an apocalyptic number.

It is an amenable number.

501666056220 is an abundant number, since it is smaller than the sum of its proper divisors (1176494427780).

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

501666056220 is a wasteful number, since it uses less digits than its factorization.

501666056220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4611812 (or 4611803 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 501666056220 in words is "five hundred one billion, six hundred sixty-six million, fifty-six thousand, two hundred twenty".