501516020661 has 8 divisors (see below), whose sum is σ = 677152433280. Its totient is φ = 330111810912.

The previous prime is 501516020651. The next prime is 501516020693. The reversal of 501516020661 is 166020615105.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 501516020661 - 2¹⁴ = 501516004277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501516020651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1058050440 + ... + 1058050913.

It is an arithmetic number, because the mean of its divisors is an integer number (84644054160).

Almost surely, 2^501516020661 is an apocalyptic number.

It is an amenable number.

501516020661 is a deficient number, since it is larger than the sum of its proper divisors (175636412619).

501516020661 is a wasteful number, since it uses less digits than its factorization.

501516020661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116101435.

The product of its (nonzero) digits is 10800, while the sum is 33.

Adding to 501516020661 its reverse (166020615105), we get a palindrome (667536635766).

The spelling of 501516020661 in words is "five hundred one billion, five hundred sixteen million, twenty thousand, six hundred sixty-one".