1865216361 has 16 divisors (see below), whose sum is σ = 2574301184. Its totient is φ = 1200334464.

The previous prime is 1865216359. The next prime is 1865216371. The reversal of 1865216361 is 1636125681.

It is not a de Polignac number, because 1865216361 - 2¹ = 1865216359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1865216351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52060 + ... + 80253.

It is an arithmetic number, because the mean of its divisors is an integer number (160893824).

Almost surely, 2^1865216361 is an apocalyptic number.

It is an amenable number.

1865216361 is a deficient number, since it is larger than the sum of its proper divisors (709084823).

1865216361 is a wasteful number, since it uses less digits than its factorization.

1865216361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132480.

The product of its digits is 51840, while the sum is 39.

The square root of 1865216361 is about 43188.1507013208. The cubic root of 1865216361 is about 1230.9575378059.

The spelling of 1865216361 in words is "one billion, eight hundred sixty-five million, two hundred sixteen thousand, three hundred sixty-one".