161105263 has 8 divisors (see below), whose sum is σ = 177564240. Its totient is φ = 144948480.

The previous prime is 161105251. The next prime is 161105281. The reversal of 161105263 is 362501161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161105263 - 2²¹ = 159008111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161105663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74428 + ... + 76561.

It is an arithmetic number, because the mean of its divisors is an integer number (22195530).

Almost surely, 2^161105263 is an apocalyptic number.

161105263 is a deficient number, since it is larger than the sum of its proper divisors (16458977).

161105263 is a wasteful number, since it uses less digits than its factorization.

161105263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151097.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161105263 is about 12692.7248059666. The cubic root of 161105263 is about 544.1307164523.

It can be divided in two parts, 161105 and 263, that multiplied together give a triangular number (42370615 = T₉₂₀₅).

The spelling of 161105263 in words is "one hundred sixty-one million, one hundred five thousand, two hundred sixty-three".