181273897260233 has 4 divisors (see below), whose sum is σ = 182490500597700. Its totient is φ = 180057293922768.

The previous prime is 181273897260227. The next prime is 181273897260259. The reversal of 181273897260233 is 332062798372181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26620099724089 + 154653797536144 = 5159467^2 + 12435988^2 .

It is a cyclic number.

It is not a de Polignac number, because 181273897260233 - 2²² = 181273893065929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181273897160233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608301668510 + ... + 608301668807.

It is an arithmetic number, because the mean of its divisors is an integer number (45622625149425).

Almost surely, 2^{181273897260233} is an apocalyptic number.

It is an amenable number.

181273897260233 is a deficient number, since it is larger than the sum of its proper divisors (1216603337467).

181273897260233 is a wasteful number, since it uses less digits than its factorization.

181273897260233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216603337466.

The product of its (nonzero) digits is 36578304, while the sum is 62.

The spelling of 181273897260233 in words is "one hundred eighty-one trillion, two hundred seventy-three billion, eight hundred ninety-seven million, two hundred sixty thousand, two hundred thirty-three".