505361645 has 4 divisors (see below), whose sum is σ = 606433980. Its totient is φ = 404289312.

The previous prime is 505361629. The next prime is 505361663. The reversal of 505361645 is 546163505.

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 62932489 + 442429156 = 7933^2 + 21034^2 .

It is a cyclic number.

It is not a de Polignac number, because 505361645 - 2⁴ = 505361629 is a prime.

It is a super-3 number, since 3×505361645³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50536160 + ... + 50536169.

It is an arithmetic number, because the mean of its divisors is an integer number (151608495).

Almost surely, 2^505361645 is an apocalyptic number.

It is an amenable number.

505361645 is a deficient number, since it is larger than the sum of its proper divisors (101072335).

505361645 is a wasteful number, since it uses less digits than its factorization.

505361645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101072334.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 505361645 is about 22480.2501098186. The cubic root of 505361645 is about 796.5274721847.

The spelling of 505361645 in words is "five hundred five million, three hundred sixty-one thousand, six hundred forty-five".