678681093665 has 8 divisors (see below), whose sum is σ = 815452154880. Its totient is φ = 542254979952.

The previous prime is 678681093661. The next prime is 678681093667. The reversal of 678681093665 is 566390186876.

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 678681093665 - 2² = 678681093661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678681093661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86232545 + ... + 86240414.

It is an arithmetic number, because the mean of its divisors is an integer number (101931519360).

Almost surely, 2^678681093665 is an apocalyptic number.

It is an amenable number.

678681093665 is a deficient number, since it is larger than the sum of its proper divisors (136771061215).

678681093665 is a wasteful number, since it uses less digits than its factorization.

678681093665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172473751.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 678681093665 in words is "six hundred seventy-eight billion, six hundred eighty-one million, ninety-three thousand, six hundred sixty-five".