2251232665161 has 16 divisors (see below), whose sum is σ = 3071696337600. Its totient is φ = 1465801001280.

The previous prime is 2251232665153. The next prime is 2251232665189. The reversal of 2251232665161 is 1615662321522.

It is not a de Polignac number, because 2251232665161 - 2³ = 2251232665153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2251232666161) 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, 922015 + ... + 2313563.

It is an arithmetic number, because the mean of its divisors is an integer number (191981021100).

Almost surely, 2^{2251232665161} is an apocalyptic number.

It is an amenable number.

2251232665161 is a deficient number, since it is larger than the sum of its proper divisors (820463672439).

2251232665161 is a wasteful number, since it uses less digits than its factorization.

2251232665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404136.

The product of its digits is 259200, while the sum is 42.

Adding to 2251232665161 its reverse (1615662321522), we get a palindrome (3866894986683).

The spelling of 2251232665161 in words is "two trillion, two hundred fifty-one billion, two hundred thirty-two million, six hundred sixty-five thousand, one hundred sixty-one".