502540540561 has 4 divisors (see below), whose sum is σ = 510041145712. Its totient is φ = 495039935412.

The previous prime is 502540540559. The next prime is 502540540571. The reversal of 502540540561 is 165045045205.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 502540540561 - 2¹ = 502540540559 is a prime.

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 502540540561.

It is not an unprimeable number, because it can be changed into a prime (502540540501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750302475 + ... + 3750302608.

It is an arithmetic number, because the mean of its divisors is an integer number (127510286428).

Almost surely, 2^502540540561 is an apocalyptic number.

It is an amenable number.

502540540561 is a deficient number, since it is larger than the sum of its proper divisors (7500605151).

502540540561 is an equidigital number, since it uses as much as digits as its factorization.

502540540561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7500605150.

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 502540540561 its reverse (165045045205), we get a palindrome (667585585766).

The spelling of 502540540561 in words is "five hundred two billion, five hundred forty million, five hundred forty thousand, five hundred sixty-one".