778023538256461 has 12 divisors (see below), whose sum is σ = 926095412412192. Its totient is φ = 651368543654808.

The previous prime is 778023538256449. The next prime is 778023538256479. The reversal of 778023538256461 is 164652835320877.

It is a happy number.

It is not a de Polignac number, because 778023538256461 - 2¹⁹ = 778023537732173 is a prime.

It is a super-2 number, since 2×778023538256461² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778023538256561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184628269905 + ... + 184628274118.

It is an arithmetic number, because the mean of its divisors is an integer number (77174617701016).

Almost surely, 2^{778023538256461} is an apocalyptic number.

It is an amenable number.

778023538256461 is a deficient number, since it is larger than the sum of its proper divisors (148071874155731).

778023538256461 is a wasteful number, since it uses less digits than its factorization.

778023538256461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369256544080 (or 369256544073 counting only the distinct ones).

The product of its (nonzero) digits is 406425600, while the sum is 67.

The spelling of 778023538256461 in words is "seven hundred seventy-eight trillion, twenty-three billion, five hundred thirty-eight million, two hundred fifty-six thousand, four hundred sixty-one".