161865415 has 32 divisors (see below), whose sum is σ = 216981504. Its totient is φ = 115345920.

The previous prime is 161865413. The next prime is 161865419. The reversal of 161865415 is 514568161.

It is not a de Polignac number, because 161865415 - 2¹ = 161865413 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 (161865413) 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 31 ways as a sum of consecutive naturals, for example, 123192 + ... + 124498.

It is an arithmetic number, because the mean of its divisors is an integer number (6780672).

Almost surely, 2^161865415 is an apocalyptic number.

161865415 is a deficient number, since it is larger than the sum of its proper divisors (55116089).

161865415 is a wasteful number, since it uses less digits than its factorization.

161865415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its digits is 28800, while the sum is 37.

The square root of 161865415 is about 12722.6339647103. The cubic root of 161865415 is about 544.9851748064.

The spelling of 161865415 in words is "one hundred sixty-one million, eight hundred sixty-five thousand, four hundred fifteen".