781220330321 has 8 divisors (see below), whose sum is σ = 794056284288. Its totient is φ = 768385314000.

The previous prime is 781220330299. The next prime is 781220330357. The reversal of 781220330321 is 123033022187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 781220330321 - 2⁶ = 781220330257 is a prime.

It is a super-2 number, since 2×781220330321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (781220330021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1557176 + ... + 1996806.

It is an arithmetic number, because the mean of its divisors is an integer number (99257035536).

Almost surely, 2^781220330321 is an apocalyptic number.

It is an amenable number.

781220330321 is a deficient number, since it is larger than the sum of its proper divisors (12835953967).

781220330321 is a wasteful number, since it uses less digits than its factorization.

781220330321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468823.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 781220330321 in words is "seven hundred eighty-one billion, two hundred twenty million, three hundred thirty thousand, three hundred twenty-one".