808240165505 has 4 divisors (see below), whose sum is σ = 969888198612. Its totient is φ = 646592132400.

The previous prime is 808240165487. The next prime is 808240165531. The reversal of 808240165505 is 505561042808.

808240165505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 603871976464 + 204368189041 = 777092^2 + 452071^2 .

It is not a de Polignac number, because 808240165505 - 2⁶ = 808240165441 is a prime.

It is a Duffinian 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, 80824016546 + ... + 80824016555.

It is an arithmetic number, because the mean of its divisors is an integer number (242472049653).

Almost surely, 2^808240165505 is an apocalyptic number.

It is an amenable number.

808240165505 is a deficient number, since it is larger than the sum of its proper divisors (161648033107).

808240165505 is a wasteful number, since it uses less digits than its factorization.

808240165505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161648033106.

The product of its (nonzero) digits is 384000, while the sum is 44.

The spelling of 808240165505 in words is "eight hundred eight billion, two hundred forty million, one hundred sixty-five thousand, five hundred five".