161305263 has 20 divisors (see below), whose sum is σ = 275386320. Its totient is φ = 92174112.

The previous prime is 161305223. The next prime is 161305267. The reversal of 161305263 is 362503161.

161305263 is a `hidden beast` number, since 1 + 6 + 130 + 526 + 3 = 666.

It is not a de Polignac number, because 161305263 - 2⁹ = 161304751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161305267) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 141678 + ... + 142811.

It is an arithmetic number, because the mean of its divisors is an integer number (13769316).

Almost surely, 2^161305263 is an apocalyptic number.

161305263 is a deficient number, since it is larger than the sum of its proper divisors (114081057).

161305263 is an equidigital number, since it uses as much as digits as its factorization.

161305263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284508 (or 284499 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 161305263 is about 12700.6008912964. The cubic root of 161305263 is about 544.3557890522.

The spelling of 161305263 in words is "one hundred sixty-one million, three hundred five thousand, two hundred sixty-three".