780740467217 has 2 divisors, whose sum is σ = 780740467218. Its totient is φ = 780740467216.

The previous prime is 780740467187. The next prime is 780740467223. The reversal of 780740467217 is 712764047087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730997640256 + 49742826961 = 854984^2 + 223031^2 .

It is a cyclic number.

It is not a de Polignac number, because 780740467217 - 2⁶ = 780740467153 is a prime.

It is not a weakly prime, because it can be changed into another prime (780740467237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390370233608 + 390370233609.

It is an arithmetic number, because the mean of its divisors is an integer number (390370233609).

Almost surely, 2^780740467217 is an apocalyptic number.

It is an amenable number.

780740467217 is a deficient number, since it is larger than the sum of its proper divisors (1).

780740467217 is an equidigital number, since it uses as much as digits as its factorization.

780740467217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3687936, while the sum is 53.

The spelling of 780740467217 in words is "seven hundred eighty billion, seven hundred forty million, four hundred sixty-seven thousand, two hundred seventeen".