778681427401 has 2 divisors, whose sum is σ = 778681427402. Its totient is φ = 778681427400.

The previous prime is 778681427339. The next prime is 778681427431. The reversal of 778681427401 is 104724186877.

778681427401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405667086400 + 373014341001 = 636920^2 + 610749^2 .

It is a cyclic number.

It is not a de Polignac number, because 778681427401 - 2²⁹ = 778144556489 is a prime.

It is a super-2 number, since 2×778681427401² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (778681427431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389340713700 + 389340713701.

It is an arithmetic number, because the mean of its divisors is an integer number (389340713701).

Almost surely, 2^778681427401 is an apocalyptic number.

It is an amenable number.

778681427401 is a deficient number, since it is larger than the sum of its proper divisors (1).

778681427401 is an equidigital number, since it uses as much as digits as its factorization.

778681427401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4214784, while the sum is 55.

The spelling of 778681427401 in words is "seven hundred seventy-eight billion, six hundred eighty-one million, four hundred twenty-seven thousand, four hundred one".