505561409153 has 4 divisors (see below), whose sum is σ = 519225231060. Its totient is φ = 491897587248.

The previous prime is 505561409149. The next prime is 505561409209. The reversal of 505561409153 is 351904165505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 485074639729 + 20486769424 = 696473^2 + 143132^2 .

It is a cyclic number.

It is not a de Polignac number, because 505561409153 - 2² = 505561409149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505561406153) 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, 6831910898 + ... + 6831910971.

It is an arithmetic number, because the mean of its divisors is an integer number (129806307765).

Almost surely, 2^505561409153 is an apocalyptic number.

It is an amenable number.

505561409153 is a deficient number, since it is larger than the sum of its proper divisors (13663821907).

505561409153 is a wasteful number, since it uses less digits than its factorization.

505561409153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13663821906.

The product of its (nonzero) digits is 405000, while the sum is 44.

The spelling of 505561409153 in words is "five hundred five billion, five hundred sixty-one million, four hundred nine thousand, one hundred fifty-three".