678643071247 has 4 divisors (see below), whose sum is σ = 708149291760. Its totient is φ = 649136850736.

The previous prime is 678643071241. The next prime is 678643071257. The reversal of 678643071247 is 742170346876.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 678643071247 - 2²³ = 678634682639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678643071241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14753110222 + ... + 14753110267.

It is an arithmetic number, because the mean of its divisors is an integer number (177037322940).

Almost surely, 2^678643071247 is an apocalyptic number.

678643071247 is a deficient number, since it is larger than the sum of its proper divisors (29506220513).

678643071247 is a wasteful number, since it uses less digits than its factorization.

678643071247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29506220512.

The product of its (nonzero) digits is 9483264, while the sum is 55.

The spelling of 678643071247 in words is "six hundred seventy-eight billion, six hundred forty-three million, seventy-one thousand, two hundred forty-seven".