165949263 has 16 divisors (see below), whose sum is σ = 251848800. Its totient is φ = 107933760.

The previous prime is 165949261. The next prime is 165949279. The reversal of 165949263 is 362949561.

It is not a de Polignac number, because 165949263 - 2¹ = 165949261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165949261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73848 + ... + 76061.

It is an arithmetic number, because the mean of its divisors is an integer number (15740550).

Almost surely, 2^165949263 is an apocalyptic number.

165949263 is a deficient number, since it is larger than the sum of its proper divisors (85899537).

165949263 is a wasteful number, since it uses less digits than its factorization.

165949263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149959 (or 149953 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 165949263 is about 12882.1295987892. The cubic root of 165949263 is about 549.5304675960.

The spelling of 165949263 in words is "one hundred sixty-five million, nine hundred forty-nine thousand, two hundred sixty-three".