505665166505 has 16 divisors (see below), whose sum is σ = 620969346624. Its totient is φ = 395086507200.

The previous prime is 505665166429. The next prime is 505665166571. The reversal of 505665166505 is 505661566505.

It is a de Polignac number, because none of the positive numbers 2^k-505665166505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2248430 + ... + 2463080.

It is an arithmetic number, because the mean of its divisors is an integer number (38810584164).

Almost surely, 2^505665166505 is an apocalyptic number.

It is an amenable number.

505665166505 is a deficient number, since it is larger than the sum of its proper divisors (115304180119).

505665166505 is a wasteful number, since it uses less digits than its factorization.

505665166505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225656.

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 505665166505 in words is "five hundred five billion, six hundred sixty-five million, one hundred sixty-six thousand, five hundred five".