161505263 has 12 divisors (see below), whose sum is σ = 176342040. Its totient is φ = 147719376.

The previous prime is 161505233. The next prime is 161505269. The reversal of 161505263 is 362505161.

It is not a de Polignac number, because 161505263 - 2¹⁴ = 161488879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161505269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2756 + ... + 18182.

It is an arithmetic number, because the mean of its divisors is an integer number (14695170).

Almost surely, 2^161505263 is an apocalyptic number.

161505263 is a deficient number, since it is larger than the sum of its proper divisors (14836777).

161505263 is a wasteful number, since it uses less digits than its factorization.

161505263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15494 (or 15475 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 161505263 is about 12708.4720954173. The cubic root of 161505263 is about 544.5806756861.

The spelling of 161505263 in words is "one hundred sixty-one million, five hundred five thousand, two hundred sixty-three".