501720055684 has 81 divisors (see below), whose sum is σ = 947844750181. Its totient is φ = 232329616000.

The previous prime is 501720055673. The next prime is 501720055687. The reversal of 501720055684 is 486550027105.

The square root of 501720055684 is 708322.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 390612500100 + 111107555584 = 624990^2 + 333328^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501720055684.

It is not an unprimeable number, because it can be changed into a prime (501720055687) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1998884559 + ... + 1998884809.

Almost surely, 2^501720055684 is an apocalyptic number.

501720055684 is the 708322-nd square number.

It is an amenable number.

501720055684 is a deficient number, since it is larger than the sum of its proper divisors (446124694497).

501720055684 is an equidigital number, since it uses as much as digits as its factorization.

501720055684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 501720055684 in words is "five hundred one billion, seven hundred twenty million, fifty-five thousand, six hundred eighty-four".