678856686457 has 8 divisors (see below), whose sum is σ = 679336061184. Its totient is φ = 678377432688.

The previous prime is 678856686419. The next prime is 678856686523. The reversal of 678856686457 is 754686658876.

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 678856686457 - 2¹⁹ = 678856162169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678856681457) 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, 13178283 + ... + 13229695.

It is an arithmetic number, because the mean of its divisors is an integer number (84917007648).

Almost surely, 2^678856686457 is an apocalyptic number.

It is an amenable number.

678856686457 is a deficient number, since it is larger than the sum of its proper divisors (479374727).

678856686457 is a wasteful number, since it uses less digits than its factorization.

678856686457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60479.

The product of its digits is 3251404800, while the sum is 76.

The spelling of 678856686457 in words is "six hundred seventy-eight billion, eight hundred fifty-six million, six hundred eighty-six thousand, four hundred fifty-seven".