161222325625 has 15 divisors (see below), whose sum is σ = 201475962523. Its totient is φ = 128969830000.

The previous prime is 161222325623. The next prime is 161222325653. The reversal of 161222325625 is 526523222161.

The square root of 161222325625 is 401525.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 155864671209 + 5357654416 = 394797^2 + 73196^2 .

It is not a de Polignac number, because 161222325625 - 2¹ = 161222325623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161222325623) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 10030095 + ... + 10046155.

Almost surely, 2^161222325625 is an apocalyptic number.

161222325625 is the 401525-th square number.

161222325625 is the 200763-rd centered octagonal number.

It is an amenable number.

161222325625 is a deficient number, since it is larger than the sum of its proper divisors (40253636898).

161222325625 is an frugal number, since it uses more digits than its factorization.

161222325625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32142 (or 16066 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

Adding to 161222325625 its reverse (526523222161), we get a palindrome (687745547786).

The spelling of 161222325625 in words is "one hundred sixty-one billion, two hundred twenty-two million, three hundred twenty-five thousand, six hundred twenty-five".