161225675552 has 18 divisors (see below), whose sum is σ = 317417520609. Its totient is φ = 80611702080.

The previous prime is 161225675503. The next prime is 161225675557. The reversal of 161225675552 is 255576522161.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 98623633936 + 62602041616 = 314044^2 + 250204^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=283924.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161225675497 and 161225675506.

It is not an unprimeable number, because it can be changed into a prime (161225675557) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2235902 + ... + 2306882.

Almost surely, 2^161225675552 is an apocalyptic number.

It is an amenable number.

161225675552 is a deficient number, since it is larger than the sum of its proper divisors (156191845057).

161225675552 is an frugal number, since it uses more digits than its factorization.

161225675552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141972 (or 70983 counting only the distinct ones).

The product of its digits is 1260000, while the sum is 47.

The spelling of 161225675552 in words is "one hundred sixty-one billion, two hundred twenty-five million, six hundred seventy-five thousand, five hundred fifty-two".