678881720714 has 4 divisors (see below), whose sum is σ = 1018322581074. Its totient is φ = 339440860356.

The previous prime is 678881720711. The next prime is 678881720723. The reversal of 678881720714 is 417027188876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 547500844489 + 131380876225 = 739933^2 + 362465^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678881720711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169720430177 + ... + 169720430180.

Almost surely, 2^678881720714 is an apocalyptic number.

678881720714 is a deficient number, since it is larger than the sum of its proper divisors (339440860360).

678881720714 is a wasteful number, since it uses less digits than its factorization.

678881720714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339440860359.

The product of its (nonzero) digits is 8429568, while the sum is 59.

The spelling of 678881720714 in words is "six hundred seventy-eight billion, eight hundred eighty-one million, seven hundred twenty thousand, seven hundred fourteen".