405505444505505 has 16 divisors (see below), whose sum is σ = 648810845916480. Its totient is φ = 216268858833728.

The previous prime is 405505444505471. The next prime is 405505444505507. The reversal of 405505444505505 is 505505444505504.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 405505444505505 - 2³¹ = 405503297021857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405505444505507) 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, 39745902 + ... + 48895271.

It is an arithmetic number, because the mean of its divisors is an integer number (40550677869780).

Almost surely, 2^{405505444505505} is an apocalyptic number.

It is an amenable number.

405505444505505 is a deficient number, since it is larger than the sum of its proper divisors (243305401410975).

405505444505505 is a wasteful number, since it uses less digits than its factorization.

405505444505505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88946160.

The product of its (nonzero) digits is 20000000, while the sum is 51.

Subtracting 405505444505505 from its reverse (505505444505504), we obtain a palindrome (99999999999999).

The spelling of 405505444505505 in words is "four hundred five trillion, five hundred five billion, four hundred forty-four million, five hundred five thousand, five hundred five".