770073215621 has 2 divisors, whose sum is σ = 770073215622. Its totient is φ = 770073215620.

The previous prime is 770073215581. The next prime is 770073215669. The reversal of 770073215621 is 126512370077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477515550625 + 292557664996 = 691025^2 + 540886^2 .

It is an emirp because it is prime and its reverse (126512370077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-770073215621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (770073205621) 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, 385036607810 + 385036607811.

It is an arithmetic number, because the mean of its divisors is an integer number (385036607811).

Almost surely, 2^770073215621 is an apocalyptic number.

It is an amenable number.

770073215621 is a deficient number, since it is larger than the sum of its proper divisors (1).

770073215621 is an equidigital number, since it uses as much as digits as its factorization.

770073215621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123480, while the sum is 41.

Adding to 770073215621 its reverse (126512370077), we get a palindrome (896585585698).

The spelling of 770073215621 in words is "seven hundred seventy billion, seventy-three million, two hundred fifteen thousand, six hundred twenty-one".