678959812189081 has 8 divisors (see below), whose sum is σ = 679253865229664. Its totient is φ = 678665763211680.

The previous prime is 678959812189079. The next prime is 678959812189147. The reversal of 678959812189081 is 180981218959876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678959812189081 - 2¹ = 678959812189079 is a prime.

It is a super-2 number, since 2×678959812189081² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678959812188986 and 678959812189004.

It is not an unprimeable number, because it can be changed into a prime (678959812189381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361183501 + ... + 363058453.

It is an arithmetic number, because the mean of its divisors is an integer number (84906733153708).

Almost surely, 2^{678959812189081} is an apocalyptic number.

It is an amenable number.

678959812189081 is a deficient number, since it is larger than the sum of its proper divisors (294053040583).

678959812189081 is a wasteful number, since it uses less digits than its factorization.

678959812189081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031591.

The product of its (nonzero) digits is 1254113280, while the sum is 82.

The spelling of 678959812189081 in words is "six hundred seventy-eight trillion, nine hundred fifty-nine billion, eight hundred twelve million, one hundred eighty-nine thousand, eighty-one".