766444421 has 2 divisors, whose sum is σ = 766444422. Its totient is φ = 766444420.

The previous prime is 766444417. The next prime is 766444429. The reversal of 766444421 is 124444667.

It is a happy number.

766444421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600936196 + 165508225 = 24514^2 + 12865^2 .

It is an emirp because it is prime and its reverse (124444667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 766444421 - 2² = 766444417 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766444429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383222210 + 383222211.

It is an arithmetic number, because the mean of its divisors is an integer number (383222211).

Almost surely, 2^766444421 is an apocalyptic number.

It is an amenable number.

766444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

766444421 is an equidigital number, since it uses as much as digits as its factorization.

766444421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 38.

The square root of 766444421 is about 27684.7326337099. The cubic root of 766444421 is about 915.1526797884.

The spelling of 766444421 in words is "seven hundred sixty-six million, four hundred forty-four thousand, four hundred twenty-one".