678539363976991 has 16 divisors (see below), whose sum is σ = 740382431040000. Its totient is φ = 616722581759200.

The previous prime is 678539363976967. The next prime is 678539363977021. The reversal of 678539363976991 is 199679363935876.

It is a cyclic number.

It is not a de Polignac number, because 678539363976991 - 2¹⁷ = 678539363845919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678539363976896 and 678539363976905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678539363976191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2458507221 + ... + 2458783201.

It is an arithmetic number, because the mean of its divisors is an integer number (46273901940000).

Almost surely, 2^{678539363976991} is an apocalyptic number.

678539363976991 is a deficient number, since it is larger than the sum of its proper divisors (61843067063009).

678539363976991 is a wasteful number, since it uses less digits than its factorization.

678539363976991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322790.

The product of its digits is 74996953920, while the sum is 91.

The spelling of 678539363976991 in words is "six hundred seventy-eight trillion, five hundred thirty-nine billion, three hundred sixty-three million, nine hundred seventy-six thousand, nine hundred ninety-one".