165785049 has 24 divisors (see below), whose sum is σ = 255062080. Its totient is φ = 107530416.

The previous prime is 165785047. The next prime is 165785069. The reversal of 165785049 is 940587561.

It is not a de Polignac number, because 165785049 - 2¹ = 165785047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165784995 and 165785013.

It is not an unprimeable number, because it can be changed into a prime (165785041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229 + ... + 18210.

Almost surely, 2^165785049 is an apocalyptic number.

It is an amenable number.

165785049 is a deficient number, since it is larger than the sum of its proper divisors (89277031).

165785049 is an equidigital number, since it uses as much as digits as its factorization.

165785049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18491 (or 18479 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 165785049 is about 12875.7543080008. The cubic root of 165785049 is about 549.3491463564.

The spelling of 165785049 in words is "one hundred sixty-five million, seven hundred eighty-five thousand, forty-nine".