789351764221 has 2 divisors, whose sum is σ = 789351764222. Its totient is φ = 789351764220.

The previous prime is 789351764219. The next prime is 789351764263. The reversal of 789351764221 is 122467153987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479225292121 + 310126472100 = 692261^2 + 556890^2 .

It is a cyclic number.

It is not a de Polignac number, because 789351764221 - 2¹ = 789351764219 is a prime.

Together with 789351764219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (789351464221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394675882110 + 394675882111.

It is an arithmetic number, because the mean of its divisors is an integer number (394675882111).

Almost surely, 2^789351764221 is an apocalyptic number.

It is an amenable number.

789351764221 is a deficient number, since it is larger than the sum of its proper divisors (1).

789351764221 is an equidigital number, since it uses as much as digits as its factorization.

789351764221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 789351764221 in words is "seven hundred eighty-nine billion, three hundred fifty-one million, seven hundred sixty-four thousand, two hundred twenty-one".