169443373225 has 81 divisors (see below), whose sum is σ = 258371731287. Its totient is φ = 109896665760.

The previous prime is 169443373223. The next prime is 169443373249. The reversal of 169443373225 is 522373344961.

The square root of 169443373225 is 411635.

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

It can be written as a sum of positive squares in only one way, i.e., 60999614361 + 108443758864 = 246981^2 + 329308^2 .

It is not a de Polignac number, because 169443373225 - 2¹ = 169443373223 is a prime.

It is a super-2 number, since 2×169443373225² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (169443373223) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 273736966 + ... + 273737584.

Almost surely, 2^169443373225 is an apocalyptic number.

169443373225 is the 411635-th square number.

169443373225 is the 205818-th centered octagonal number.

It is an amenable number.

169443373225 is a deficient number, since it is larger than the sum of its proper divisors (88928358062).

169443373225 is an frugal number, since it uses more digits than its factorization.

169443373225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300 (or 650 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 49.

Multiplying 169443373225 by its sum of digits (49), we get a square (8302725288025 = 2881445²).

169443373225 divided by its sum of digits (49) gives a square (3458028025 = 58805²).

The spelling of 169443373225 in words is "one hundred sixty-nine billion, four hundred forty-three million, three hundred seventy-three thousand, two hundred twenty-five".