778542134910321 has 32 divisors (see below), whose sum is σ = 1076491785600000. Its totient is φ = 499899217946688.

The previous prime is 778542134910301. The next prime is 778542134910377. The reversal of 778542134910321 is 123019431245877.

It is a happy number.

778542134910321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 778542134910321 - 2²⁶ = 778542067801457 is a prime.

It is a super-2 number, since 2×778542134910321² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (778542134910301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91568620 + ... + 99709058.

It is an arithmetic number, because the mean of its divisors is an integer number (33640368300000).

Almost surely, 2^{778542134910321} is an apocalyptic number.

It is an amenable number.

778542134910321 is a deficient number, since it is larger than the sum of its proper divisors (297949650689679).

778542134910321 is a wasteful number, since it uses less digits than its factorization.

778542134910321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8143173.

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 778542134910321 in words is "seven hundred seventy-eight trillion, five hundred forty-two billion, one hundred thirty-four million, nine hundred ten thousand, three hundred twenty-one".