155224180225 has 9 divisors (see below), whose sum is σ = 192480426217. Its totient is φ = 124177768240.

The previous prime is 155224180183. The next prime is 155224180229. The reversal of 155224180225 is 522081422551.

The square root of 155224180225 is 393985.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6456604609 + 148767575616 = 80353^2 + 385704^2 .

It is a de Polignac number, because none of the positive numbers 2^k-155224180225 is a prime.

It is a super-2 number, since 2×155224180225² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155224180229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1930527 + ... + 2009323.

Almost surely, 2^155224180225 is an apocalyptic number.

155224180225 is the 393985-th square number.

155224180225 is the 196993-rd centered octagonal number.

It is an amenable number.

155224180225 is a deficient number, since it is larger than the sum of its proper divisors (37256245992).

155224180225 is an frugal number, since it uses more digits than its factorization.

155224180225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157604 (or 78802 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 37.

The spelling of 155224180225 in words is "one hundred fifty-five billion, two hundred twenty-four million, one hundred eighty thousand, two hundred twenty-five".