161234212225 has 12 divisors (see below), whose sum is σ = 211691036844. Its totient is φ = 121399877120.

The previous prime is 161234212219. The next prime is 161234212229. The reversal of 161234212225 is 522212432161.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 464488704 + 160769723521 = 21552^2 + 400961^2 .

It is not a de Polignac number, because 161234212225 - 2⁹ = 161234211713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161234212229) 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 11 ways as a sum of consecutive naturals, for example, 189686884 + ... + 189687733.

It is an arithmetic number, because the mean of its divisors is an integer number (17640919737).

Almost surely, 2^161234212225 is an apocalyptic number.

It is an amenable number.

161234212225 is a deficient number, since it is larger than the sum of its proper divisors (50456824619).

161234212225 is a wasteful number, since it uses less digits than its factorization.

161234212225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379374644 (or 379374639 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

Adding to 161234212225 its reverse (522212432161), we get a palindrome (683446644386).

The spelling of 161234212225 in words is "one hundred sixty-one billion, two hundred thirty-four million, two hundred twelve thousand, two hundred twenty-five".