405685480509 has 16 divisors (see below), whose sum is σ = 602718134400. Its totient is φ = 269690813568.

The previous prime is 405685480399. The next prime is 405685480511. The reversal of 405685480509 is 905084586504.

405685480509 is a `hidden beast` number, since 4 + 0 + 5 + 6 + 8 + 54 + 80 + 509 = 666.

It is not a de Polignac number, because 405685480509 - 2¹¹ = 405685478461 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405685480609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21272889 + ... + 21291950.

It is an arithmetic number, because the mean of its divisors is an integer number (37669883400).

Almost surely, 2^405685480509 is an apocalyptic number.

It is an amenable number.

405685480509 is a deficient number, since it is larger than the sum of its proper divisors (197032653891).

405685480509 is a wasteful number, since it uses less digits than its factorization.

405685480509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42565201 (or 42565195 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

The spelling of 405685480509 in words is "four hundred five billion, six hundred eighty-five million, four hundred eighty thousand, five hundred nine".