678111106561 has 8 divisors (see below), whose sum is σ = 775036848704. Its totient is φ = 581198546160.

The previous prime is 678111106531. The next prime is 678111106571. The reversal of 678111106561 is 165601111876.

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 678111106561 - 2¹³ = 678111098369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678111106531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3184950 + ... + 3391183.

It is an arithmetic number, because the mean of its divisors is an integer number (96879606088).

Almost surely, 2^678111106561 is an apocalyptic number.

It is an amenable number.

678111106561 is a deficient number, since it is larger than the sum of its proper divisors (96925742143).

678111106561 is a wasteful number, since it uses less digits than its factorization.

678111106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6590871.

The product of its (nonzero) digits is 60480, while the sum is 43.

The spelling of 678111106561 in words is "six hundred seventy-eight billion, one hundred eleven million, one hundred six thousand, five hundred sixty-one".