506361564561 has 4 divisors (see below), whose sum is σ = 675148752752. Its totient is φ = 337574376372.

The previous prime is 506361564529. The next prime is 506361564563. The reversal of 506361564561 is 165465163605.

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 not a de Polignac number, because 506361564561 - 2⁵ = 506361564529 is a prime.

It is a super-2 number, since 2×506361564561² (a number of 24 digits) contains 22 as substring.

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 506361564561.

It is not an unprimeable number, because it can be changed into a prime (506361564563) 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, 84393594091 + ... + 84393594096.

It is an arithmetic number, because the mean of its divisors is an integer number (168787188188).

Almost surely, 2^506361564561 is an apocalyptic number.

It is an amenable number.

506361564561 is a deficient number, since it is larger than the sum of its proper divisors (168787188191).

506361564561 is a wasteful number, since it uses less digits than its factorization.

506361564561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168787188190.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 506361564561 in words is "five hundred six billion, three hundred sixty-one million, five hundred sixty-four thousand, five hundred sixty-one".