161865275 has 48 divisors (see below), whose sum is σ = 248317440. Its totient is φ = 102902400.

The previous prime is 161865257. The next prime is 161865293. The reversal of 161865275 is 572568161.

It is an interprime number because it is at equal distance from previous prime (161865257) and next prime (161865293).

It is not a de Polignac number, because 161865275 - 2¹² = 161861179 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 66734 + ... + 69116.

It is an arithmetic number, because the mean of its divisors is an integer number (5173280).

Almost surely, 2^161865275 is an apocalyptic number.

161865275 is a deficient number, since it is larger than the sum of its proper divisors (86452165).

161865275 is a wasteful number, since it uses less digits than its factorization.

161865275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436 (or 2431 counting only the distinct ones).

The product of its digits is 100800, while the sum is 41.

The square root of 161865275 is about 12722.6284627038. The cubic root of 161865275 is about 544.9850176843.

The spelling of 161865275 in words is "one hundred sixty-one million, eight hundred sixty-five thousand, two hundred seventy-five".