165609473 has 2 divisors, whose sum is σ = 165609474. Its totient is φ = 165609472.

The previous prime is 165609463. The next prime is 165609487. The reversal of 165609473 is 374906561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124032769 + 41576704 = 11137^2 + 6448^2 .

It is a cyclic number.

It is not a de Polignac number, because 165609473 - 2⁸ = 165609217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165609473.

It is not a weakly prime, because it can be changed into another prime (165609403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82804736 + 82804737.

It is an arithmetic number, because the mean of its divisors is an integer number (82804737).

It is a Proth number, since it is equal to 2527 ⋅ 2¹⁶ + 1 and 2527 < 2¹⁶.

Almost surely, 2^165609473 is an apocalyptic number.

It is an amenable number.

165609473 is a deficient number, since it is larger than the sum of its proper divisors (1).

165609473 is an equidigital number, since it uses as much as digits as its factorization.

165609473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 165609473 is about 12868.9344158714. The cubic root of 165609473 is about 549.1551469659.

The spelling of 165609473 in words is "one hundred sixty-five million, six hundred nine thousand, four hundred seventy-three".