161042644225 has 24 divisors (see below), whose sum is σ = 200102500160. Its totient is φ = 128570137920.

The previous prime is 161042644207. The next prime is 161042644249. The reversal of 161042644225 is 522446240161.

It is not a de Polignac number, because 161042644225 - 2¹⁹ = 161042119937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32485447 + ... + 32490403.

Almost surely, 2^161042644225 is an apocalyptic number.

It is an amenable number.

161042644225 is a deficient number, since it is larger than the sum of its proper divisors (39059855935).

161042644225 is a wasteful number, since it uses less digits than its factorization.

161042644225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7369 (or 7364 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

Adding to 161042644225 its reverse (522446240161), we get a palindrome (683488884386).

The spelling of 161042644225 in words is "one hundred sixty-one billion, forty-two million, six hundred forty-four thousand, two hundred twenty-five".