561502240321 has 4 divisors (see below), whose sum is σ = 612547898544. Its totient is φ = 510456582100.

The previous prime is 561502240301. The next prime is 561502240337. The reversal of 561502240321 is 123042205165.

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 561502240321 - 2⁷ = 561502240193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561502240301) 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, 25522829095 + ... + 25522829116.

It is an arithmetic number, because the mean of its divisors is an integer number (153136974636).

Almost surely, 2^561502240321 is an apocalyptic number.

It is an amenable number.

561502240321 is a deficient number, since it is larger than the sum of its proper divisors (51045658223).

561502240321 is a wasteful number, since it uses less digits than its factorization.

561502240321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51045658222.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 561502240321 its reverse (123042205165), we get a palindrome (684544445486).

The spelling of 561502240321 in words is "five hundred sixty-one billion, five hundred two million, two hundred forty thousand, three hundred twenty-one".