165545723321705 has 16 divisors (see below), whose sum is σ = 198749140936704. Its totient is φ = 132373732614720.

The previous prime is 165545723321653. The next prime is 165545723321731. The reversal of 165545723321705 is 507123327545561.

It is not a de Polignac number, because 165545723321705 - 2³² = 165541428354409 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, 624349139 + ... + 624614231.

It is an arithmetic number, because the mean of its divisors is an integer number (12421821308544).

Almost surely, 2^{165545723321705} is an apocalyptic number.

It is an amenable number.

165545723321705 is a deficient number, since it is larger than the sum of its proper divisors (33203417614999).

165545723321705 is a wasteful number, since it uses less digits than its factorization.

165545723321705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323896.

The product of its (nonzero) digits is 26460000, while the sum is 56.

The spelling of 165545723321705 in words is "one hundred sixty-five trillion, five hundred forty-five billion, seven hundred twenty-three million, three hundred twenty-one thousand, seven hundred five".