505204561645 has 16 divisors (see below), whose sum is σ = 694095896448. Its totient is φ = 345804022080.

The previous prime is 505204561643. The next prime is 505204561703. The reversal of 505204561645 is 546165402505.

It is not a de Polignac number, because 505204561645 - 2¹ = 505204561643 is a prime.

It is a super-3 number, since 3×505204561645³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505204561643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12937791 + ... + 12976780.

It is an arithmetic number, because the mean of its divisors is an integer number (43380993528).

Almost surely, 2^505204561645 is an apocalyptic number.

It is an amenable number.

505204561645 is a deficient number, since it is larger than the sum of its proper divisors (188891334803).

505204561645 is a wasteful number, since it uses less digits than its factorization.

505204561645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25915140.

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 505204561645 in words is "five hundred five billion, two hundred four million, five hundred sixty-one thousand, six hundred forty-five".