181740192021025 has 81 divisors (see below), whose sum is σ = 258969818023833. Its totient is φ = 126416096294400.

The previous prime is 181740192021019. The next prime is 181740192021061. The reversal of 181740192021025 is 520120291047181.

The square root of 181740192021025 is 13481105.

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 74329934633361 + 107410257387664 = 8621481^2 + 10363892^2 .

It is not a de Polignac number, because 181740192021025 - 2¹³ = 181740192012833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 17053592497 + ... + 17053603153.

Almost surely, 2^{181740192021025} is an apocalyptic number.

181740192021025 is the 13481105-th square number.

181740192021025 is the 6740553-rd centered octagonal number.

It is an amenable number.

181740192021025 is a deficient number, since it is larger than the sum of its proper divisors (77229626002808).

181740192021025 is an frugal number, since it uses more digits than its factorization.

181740192021025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21392 (or 10696 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 181740192021025 in words is "one hundred eighty-one trillion, seven hundred forty billion, one hundred ninety-two million, twenty-one thousand, twenty-five".