1781325332213 has 4 divisors (see below), whose sum is σ = 2035800379680. Its totient is φ = 1526850284748.

The previous prime is 1781325332153. The next prime is 1781325332239. The reversal of 1781325332213 is 3122335231871.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1781325332213 - 2³⁴ = 1764145463029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781325332713) 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, 127237523723 + ... + 127237523736.

It is an arithmetic number, because the mean of its divisors is an integer number (508950094920).

Almost surely, 2^{1781325332213} is an apocalyptic number.

It is an amenable number.

1781325332213 is a deficient number, since it is larger than the sum of its proper divisors (254475047467).

1781325332213 is an equidigital number, since it uses as much as digits as its factorization.

1781325332213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254475047466.

The product of its digits is 181440, while the sum is 41.

The spelling of 1781325332213 in words is "one trillion, seven hundred eighty-one billion, three hundred twenty-five million, three hundred thirty-two thousand, two hundred thirteen".