770664421 has 2 divisors, whose sum is σ = 770664422. Its totient is φ = 770664420.

The previous prime is 770664409. The next prime is 770664443. The reversal of 770664421 is 124466077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607080321 + 163584100 = 24639^2 + 12790^2 .

It is an emirp because it is prime and its reverse (124466077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 770664421 - 2¹⁷ = 770533349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (770664481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385332210 + 385332211.

It is an arithmetic number, because the mean of its divisors is an integer number (385332211).

Almost surely, 2^770664421 is an apocalyptic number.

It is an amenable number.

770664421 is a deficient number, since it is larger than the sum of its proper divisors (1).

770664421 is an equidigital number, since it uses as much as digits as its factorization.

770664421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 770664421 is about 27760.8433049142. The cubic root of 770664421 is about 916.8291997124.

It can be divided in two parts, 7706 and 64421, that added together give a palindrome (72127).

The spelling of 770664421 in words is "seven hundred seventy million, six hundred sixty-four thousand, four hundred twenty-one".