501500642136721 has 16 divisors (see below), whose sum is σ = 504119877682176. Its totient is φ = 498890422800000.

The previous prime is 501500642136719. The next prime is 501500642136731. The reversal of 501500642136721 is 127631246005105.

It is a cyclic number.

It is not a de Polignac number, because 501500642136721 - 2¹ = 501500642136719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501500642136731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193769616 + ... + 196340686.

It is an arithmetic number, because the mean of its divisors is an integer number (31507492355136).

Almost surely, 2^{501500642136721} is an apocalyptic number.

It is an amenable number.

501500642136721 is a deficient number, since it is larger than the sum of its proper divisors (2619235545455).

501500642136721 is a wasteful number, since it uses less digits than its factorization.

501500642136721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572824.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 501500642136721 in words is "five hundred one trillion, five hundred billion, six hundred forty-two million, one hundred thirty-six thousand, seven hundred twenty-one".