678118551 has 16 divisors (see below), whose sum is σ = 987258240. Its totient is φ = 410604320.

The previous prime is 678118547. The next prime is 678118577. The reversal of 678118551 is 155811876.

It is a cyclic number.

It is not a de Polignac number, because 678118551 - 2² = 678118547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678118451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29545 + ... + 47213.

It is an arithmetic number, because the mean of its divisors is an integer number (61703640).

Almost surely, 2^678118551 is an apocalyptic number.

678118551 is a deficient number, since it is larger than the sum of its proper divisors (309139689).

678118551 is a wasteful number, since it uses less digits than its factorization.

678118551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18846.

The product of its digits is 67200, while the sum is 42.

The square root of 678118551 is about 26040.7094949427. The cubic root of 678118551 is about 878.5541646268.

The spelling of 678118551 in words is "six hundred seventy-eight million, one hundred eighteen thousand, five hundred fifty-one".