165165050566505 has 12 divisors (see below), whose sum is σ = 217854066698436. Its totient is φ = 120120036775200.

The previous prime is 165165050566429. The next prime is 165165050566561. The reversal of 165165050566505 is 505665050561561.

It can be written as a sum of positive squares in 2 ways, for example, as 49576469595136 + 115588580971369 = 7041056^2 + 10751213^2 .

It is not a de Polignac number, because 165165050566505 - 2¹⁴ = 165165050550121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136500041186 + ... + 136500042395.

It is an arithmetic number, because the mean of its divisors is an integer number (18154505558203).

Almost surely, 2^{165165050566505} is an apocalyptic number.

It is an amenable number.

165165050566505 is a deficient number, since it is larger than the sum of its proper divisors (52689016131931).

165165050566505 is a wasteful number, since it uses less digits than its factorization.

165165050566505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273000083608 (or 273000083597 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 56.

The spelling of 165165050566505 in words is "one hundred sixty-five trillion, one hundred sixty-five billion, fifty million, five hundred sixty-six thousand, five hundred five".