778180896641 has 2 divisors, whose sum is σ = 778180896642. Its totient is φ = 778180896640.

The previous prime is 778180896601. The next prime is 778180896761. The reversal of 778180896641 is 146698081877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526598400241 + 251582496400 = 725671^2 + 501580^2 .

It is a cyclic number.

It is not a de Polignac number, because 778180896641 - 2³⁸ = 503302989697 is a prime.

It is not a weakly prime, because it can be changed into another prime (778180896601) 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, 389090448320 + 389090448321.

It is an arithmetic number, because the mean of its divisors is an integer number (389090448321).

Almost surely, 2^778180896641 is an apocalyptic number.

It is an amenable number.

778180896641 is a deficient number, since it is larger than the sum of its proper divisors (1).

778180896641 is an equidigital number, since it uses as much as digits as its factorization.

778180896641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 778180896641 in words is "seven hundred seventy-eight billion, one hundred eighty million, eight hundred ninety-six thousand, six hundred forty-one".