181275520225 has 12 divisors (see below), whose sum is σ = 224830748800. Its totient is φ = 144988736400.

The previous prime is 181275520199. The next prime is 181275520229. The reversal of 181275520225 is 522025572181.

It is a de Polignac number, because none of the positive numbers 2^k-181275520225 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181275520229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 674925 + ... + 904474.

Almost surely, 2^181275520225 is an apocalyptic number.

It is an amenable number.

181275520225 is a deficient number, since it is larger than the sum of its proper divisors (43555228575).

181275520225 is a wasteful number, since it uses less digits than its factorization.

181275520225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584000 (or 1583995 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 40.

The spelling of 181275520225 in words is "one hundred eighty-one billion, two hundred seventy-five million, five hundred twenty thousand, two hundred twenty-five".