678687616551161 has 16 divisors (see below), whose sum is σ = 775836889420800. Its totient is φ = 581586836373648.

The previous prime is 678687616551053. The next prime is 678687616551227. The reversal of 678687616551161 is 161155616786876.

It is a de Polignac number, because none of the positive numbers 2^k-678687616551161 is a prime.

It is a Smith number, since the sum of its digits (74) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678687616541161) 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, 458697410 + ... + 460174628.

It is an arithmetic number, because the mean of its divisors is an integer number (48489805588800).

Almost surely, 2^{678687616551161} is an apocalyptic number.

It is an amenable number.

678687616551161 is a deficient number, since it is larger than the sum of its proper divisors (97149272869639).

678687616551161 is a wasteful number, since it uses less digits than its factorization.

678687616551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493588.

The product of its digits is 609638400, while the sum is 74.

The spelling of 678687616551161 in words is "six hundred seventy-eight trillion, six hundred eighty-seven billion, six hundred sixteen million, five hundred fifty-one thousand, one hundred sixty-one".